Windows application with mock hardware layer

.gitignore

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+.vs/
+bin/
+obj/
+
+*.user

LICENSE

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+This is free and unencumbered software released into the public domain.
+
+Anyone is free to copy, modify, publish, use, compile, sell, or
+distribute this software, either in source code form or as a compiled
+binary, for any purpose, commercial or non-commercial, and by any
+means.
+
+In jurisdictions that recognize copyright laws, the author or authors
+of this software dedicate any and all copyright interest in the
+software to the public domain. We make this dedication for the benefit
+of the public at large and to the detriment of our heirs and
+successors. We intend this dedication to be an overt act of
+relinquishment in perpetuity of all present and future rights to this
+software under copyright law.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR
+OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+OTHER DEALINGS IN THE SOFTWARE.
+
+For more information, please refer to <https://unlicense.org>

Windows/App.config

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+<?xml version="1.0" encoding="utf-8" ?>
+<configuration>
+    <startup> 
+        <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.7.2" />
+    </startup>
+</configuration>

Windows/Forms/SettingsForm.Designer.cs

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+
+namespace MassiveKnob.Forms
+{
+    partial class SettingsForm
+    {
+        /// <summary>
+        /// Required designer variable.
+        /// </summary>
+        private System.ComponentModel.IContainer components = null;
+
+        /// <summary>
+        /// Clean up any resources being used.
+        /// </summary>
+        /// <param name="disposing">true if managed resources should be disposed; otherwise, false.</param>
+        protected override void Dispose(bool disposing)
+        {
+            if (disposing && (components != null))
+            {
+                components.Dispose();
+            }
+            base.Dispose(disposing);
+        }
+
+        #region Windows Form Designer generated code
+
+        /// <summary>
+        /// Required method for Designer support - do not modify
+        /// the contents of this method with the code editor.
+        /// </summary>
+        private void InitializeComponent()
+        {
+            this.components = new System.ComponentModel.Container();
+            System.ComponentModel.ComponentResourceManager resources = new System.ComponentModel.ComponentResourceManager(typeof(SettingsForm));
+            this.NotifyIcon = new System.Windows.Forms.NotifyIcon(this.components);
+            this.NotifyIconMenu = new System.Windows.Forms.ContextMenuStrip(this.components);
+            this.SettingsToolStripMenuItem = new System.Windows.Forms.ToolStripMenuItem();
+            this.QuitToolStripMenuItem = new System.Windows.Forms.ToolStripMenuItem();
+            this.CommunicationGroupbox = new System.Windows.Forms.GroupBox();
+            this.SerialPortStatusLabel = new System.Windows.Forms.Label();
+            this.SerialPortCombobox = new System.Windows.Forms.ComboBox();
+            this.SerialPortLabel = new System.Windows.Forms.Label();
+            this.DevicesGroupbox = new System.Windows.Forms.GroupBox();
+            this.DevicesPanel = new System.Windows.Forms.Panel();
+            this.DeviceCountUnknownLabel = new System.Windows.Forms.Label();
+            this.CloseButton = new System.Windows.Forms.Button();
+            this.NotifyIconMenu.SuspendLayout();
+            this.CommunicationGroupbox.SuspendLayout();
+            this.DevicesGroupbox.SuspendLayout();
+            this.DevicesPanel.SuspendLayout();
+            this.SuspendLayout();
+            // 
+            // NotifyIcon
+            // 
+            this.NotifyIcon.ContextMenuStrip = this.NotifyIconMenu;
+            this.NotifyIcon.Icon = ((System.Drawing.Icon)(resources.GetObject("NotifyIcon.Icon")));
+            this.NotifyIcon.Text = "Massive Knob";
+            this.NotifyIcon.Visible = true;
+            this.NotifyIcon.DoubleClick += new System.EventHandler(this.NotifyIcon_DoubleClick);
+            // 
+            // NotifyIconMenu
+            // 
+            this.NotifyIconMenu.Items.AddRange(new System.Windows.Forms.ToolStripItem[] {
+            this.SettingsToolStripMenuItem,
+            this.QuitToolStripMenuItem});
+            this.NotifyIconMenu.Name = "NotifyIconMenu";
+            this.NotifyIconMenu.Size = new System.Drawing.Size(121, 48);
+            // 
+            // SettingsToolStripMenuItem
+            // 
+            this.SettingsToolStripMenuItem.Font = new System.Drawing.Font("Segoe UI", 9F, System.Drawing.FontStyle.Bold);
+            this.SettingsToolStripMenuItem.Name = "SettingsToolStripMenuItem";
+            this.SettingsToolStripMenuItem.Size = new System.Drawing.Size(120, 22);
+            this.SettingsToolStripMenuItem.Text = "&Settings";
+            this.SettingsToolStripMenuItem.Click += new System.EventHandler(this.SettingsToolStripMenuItem_Click);
+            // 
+            // QuitToolStripMenuItem
+            // 
+            this.QuitToolStripMenuItem.Name = "QuitToolStripMenuItem";
+            this.QuitToolStripMenuItem.Size = new System.Drawing.Size(120, 22);
+            this.QuitToolStripMenuItem.Text = "&Quit";
+            this.QuitToolStripMenuItem.Click += new System.EventHandler(this.QuitToolStripMenuItem_Click);
+            // 
+            // CommunicationGroupbox
+            // 
+            this.CommunicationGroupbox.Anchor = ((System.Windows.Forms.AnchorStyles)(((System.Windows.Forms.AnchorStyles.Top | System.Windows.Forms.AnchorStyles.Left) 
+            | System.Windows.Forms.AnchorStyles.Right)));
+            this.CommunicationGroupbox.Controls.Add(this.SerialPortStatusLabel);
+            this.CommunicationGroupbox.Controls.Add(this.SerialPortCombobox);
+            this.CommunicationGroupbox.Controls.Add(this.SerialPortLabel);
+            this.CommunicationGroupbox.Location = new System.Drawing.Point(12, 12);
+            this.CommunicationGroupbox.Name = "CommunicationGroupbox";
+            this.CommunicationGroupbox.Size = new System.Drawing.Size(455, 52);
+            this.CommunicationGroupbox.TabIndex = 1;
+            this.CommunicationGroupbox.TabStop = false;
+            this.CommunicationGroupbox.Text = " Communication ";
+            // 
+            // SerialPortStatusLabel
+            // 
+            this.SerialPortStatusLabel.Anchor = ((System.Windows.Forms.AnchorStyles)(((System.Windows.Forms.AnchorStyles.Top | System.Windows.Forms.AnchorStyles.Left) 
+            | System.Windows.Forms.AnchorStyles.Right)));
+            this.SerialPortStatusLabel.AutoEllipsis = true;
+            this.SerialPortStatusLabel.Location = new System.Drawing.Point(261, 22);
+            this.SerialPortStatusLabel.Name = "SerialPortStatusLabel";
+            this.SerialPortStatusLabel.Size = new System.Drawing.Size(188, 18);
+            this.SerialPortStatusLabel.TabIndex = 2;
+            this.SerialPortStatusLabel.Text = "[runtime]";
+            // 
+            // SerialPortCombobox
+            // 
+            this.SerialPortCombobox.DropDownStyle = System.Windows.Forms.ComboBoxStyle.DropDownList;
+            this.SerialPortCombobox.FormattingEnabled = true;
+            this.SerialPortCombobox.Location = new System.Drawing.Point(107, 19);
+            this.SerialPortCombobox.Name = "SerialPortCombobox";
+            this.SerialPortCombobox.Size = new System.Drawing.Size(148, 21);
+            this.SerialPortCombobox.TabIndex = 1;
+            this.SerialPortCombobox.SelectedIndexChanged += new System.EventHandler(this.SerialPortCombobox_SelectedIndexChanged);
+            // 
+            // SerialPortLabel
+            // 
+            this.SerialPortLabel.AutoSize = true;
+            this.SerialPortLabel.Location = new System.Drawing.Point(10, 22);
+            this.SerialPortLabel.Name = "SerialPortLabel";
+            this.SerialPortLabel.Size = new System.Drawing.Size(54, 13);
+            this.SerialPortLabel.TabIndex = 0;
+            this.SerialPortLabel.Text = "Serial port";
+            // 
+            // DevicesGroupbox
+            // 
+            this.DevicesGroupbox.Anchor = ((System.Windows.Forms.AnchorStyles)((((System.Windows.Forms.AnchorStyles.Top | System.Windows.Forms.AnchorStyles.Bottom) 
+            | System.Windows.Forms.AnchorStyles.Left) 
+            | System.Windows.Forms.AnchorStyles.Right)));
+            this.DevicesGroupbox.Controls.Add(this.DevicesPanel);
+            this.DevicesGroupbox.Location = new System.Drawing.Point(12, 70);
+            this.DevicesGroupbox.Name = "DevicesGroupbox";
+            this.DevicesGroupbox.Size = new System.Drawing.Size(455, 57);
+            this.DevicesGroupbox.TabIndex = 2;
+            this.DevicesGroupbox.TabStop = false;
+            this.DevicesGroupbox.Text = " Audio devices ";
+            // 
+            // DevicesPanel
+            // 
+            this.DevicesPanel.Anchor = ((System.Windows.Forms.AnchorStyles)((((System.Windows.Forms.AnchorStyles.Top | System.Windows.Forms.AnchorStyles.Bottom) 
+            | System.Windows.Forms.AnchorStyles.Left) 
+            | System.Windows.Forms.AnchorStyles.Right)));
+            this.DevicesPanel.Controls.Add(this.DeviceCountUnknownLabel);
+            this.DevicesPanel.Location = new System.Drawing.Point(13, 19);
+            this.DevicesPanel.Name = "DevicesPanel";
+            this.DevicesPanel.Size = new System.Drawing.Size(436, 32);
+            this.DevicesPanel.TabIndex = 1;
+            // 
+            // DeviceCountUnknownLabel
+            // 
+            this.DeviceCountUnknownLabel.Anchor = ((System.Windows.Forms.AnchorStyles)(((System.Windows.Forms.AnchorStyles.Top | System.Windows.Forms.AnchorStyles.Left) 
+            | System.Windows.Forms.AnchorStyles.Right)));
+            this.DeviceCountUnknownLabel.Location = new System.Drawing.Point(0, 0);
+            this.DeviceCountUnknownLabel.Name = "DeviceCountUnknownLabel";
+            this.DeviceCountUnknownLabel.Size = new System.Drawing.Size(436, 32);
+            this.DeviceCountUnknownLabel.TabIndex = 1;
+            this.DeviceCountUnknownLabel.Text = "Insert Massive Knob to continue...";
+            this.DeviceCountUnknownLabel.TextAlign = System.Drawing.ContentAlignment.MiddleCenter;
+            // 
+            // CloseButton
+            // 
+            this.CloseButton.Anchor = ((System.Windows.Forms.AnchorStyles)((System.Windows.Forms.AnchorStyles.Bottom | System.Windows.Forms.AnchorStyles.Right)));
+            this.CloseButton.DialogResult = System.Windows.Forms.DialogResult.Cancel;
+            this.CloseButton.Location = new System.Drawing.Point(392, 133);
+            this.CloseButton.Name = "CloseButton";
+            this.CloseButton.Size = new System.Drawing.Size(75, 23);
+            this.CloseButton.TabIndex = 3;
+            this.CloseButton.Text = "Close";
+            this.CloseButton.UseVisualStyleBackColor = true;
+            this.CloseButton.Click += new System.EventHandler(this.CloseButton_Click);
+            // 
+            // SettingsForm
+            // 
+            this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 13F);
+            this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
+            this.CancelButton = this.CloseButton;
+            this.ClientSize = new System.Drawing.Size(479, 168);
+            this.Controls.Add(this.CloseButton);
+            this.Controls.Add(this.DevicesGroupbox);
+            this.Controls.Add(this.CommunicationGroupbox);
+            this.Icon = ((System.Drawing.Icon)(resources.GetObject("$this.Icon")));
+            this.Name = "SettingsForm";
+            this.StartPosition = System.Windows.Forms.FormStartPosition.CenterScreen;
+            this.Text = "Massive Knob - Settings";
+            this.FormClosing += new System.Windows.Forms.FormClosingEventHandler(this.SettingsForm_FormClosing);
+            this.FormClosed += new System.Windows.Forms.FormClosedEventHandler(this.SettingsForm_FormClosed);
+            this.NotifyIconMenu.ResumeLayout(false);
+            this.CommunicationGroupbox.ResumeLayout(false);
+            this.CommunicationGroupbox.PerformLayout();
+            this.DevicesGroupbox.ResumeLayout(false);
+            this.DevicesPanel.ResumeLayout(false);
+            this.ResumeLayout(false);
+
+        }
+
+        #endregion
+
+        private System.Windows.Forms.NotifyIcon NotifyIcon;
+        private System.Windows.Forms.ContextMenuStrip NotifyIconMenu;
+        private System.Windows.Forms.ToolStripMenuItem QuitToolStripMenuItem;
+        private System.Windows.Forms.ToolStripMenuItem SettingsToolStripMenuItem;
+        private System.Windows.Forms.GroupBox CommunicationGroupbox;
+        private System.Windows.Forms.Label SerialPortStatusLabel;
+        private System.Windows.Forms.ComboBox SerialPortCombobox;
+        private System.Windows.Forms.Label SerialPortLabel;
+        private System.Windows.Forms.GroupBox DevicesGroupbox;
+        private System.Windows.Forms.Button CloseButton;
+        private System.Windows.Forms.Panel DevicesPanel;
+        private System.Windows.Forms.Label DeviceCountUnknownLabel;
+    }
+}
+

Windows/Forms/SettingsForm.cs

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+using System;
+using System.Collections.Generic;
+using System.IO.Ports;
+using System.Linq;
+using System.Threading.Tasks;
+using System.Windows.Forms;
+using MassiveKnob.Hardware;
+using MassiveKnob.Settings;
+using MassiveKnob.UserControls;
+using Nito.AsyncEx;
+
+namespace MassiveKnob.Forms
+{
+    public partial class SettingsForm : Form, IMassiveKnobHardwareObserver
+    {
+        private readonly IAudioDeviceManager audioDeviceManager;
+        private readonly IMassiveKnobHardwareFactory massiveKnobHardwareFactory;
+        private readonly List<KnobDeviceControl> knobDeviceControls = new List<KnobDeviceControl>();
+
+        private bool loading = true;
+        private IMassiveKnobHardware hardware;
+        private IAudioDevice[] devices;
+        private Settings.Settings settings;
+        
+        private readonly AsyncLock saveSettingsLock = new AsyncLock();
+        private readonly AsyncLock setVolumeLock = new AsyncLock();
+
+        private bool startupVisibleCalled;
+        private bool closing;
+
+
+        public SettingsForm(IAudioDeviceManagerFactory audioDeviceManagerFactory, IMassiveKnobHardwareFactory massiveKnobHardwareFactory)
+        {
+            audioDeviceManager = audioDeviceManagerFactory.Create();
+            this.massiveKnobHardwareFactory = massiveKnobHardwareFactory;
+            
+            InitializeComponent();
+
+            SerialPortStatusLabel.Text = Strings.StatusNotConnected;
+
+            Task.Run(async () =>
+            {
+                await LoadSettings();
+
+                await Task.WhenAll(
+                    LoadSerialPorts(),
+                    LoadAudioDevices()
+                );
+
+                loading = false;
+                await Connect();
+            }).ContinueWith(t =>
+            {
+                if (t.IsFaulted && t.Exception != null)
+                    SafeCall(() => throw t.Exception);
+            });
+        }
+        
+        
+        private void SafeCall(Action action)
+        {
+            if (InvokeRequired)
+                Invoke(action);
+            else
+                action();
+        }
+
+
+        private Task LoadSerialPorts()
+        {
+            var portNames = SerialPort.GetPortNames();
+            
+            SafeCall(() =>
+            {
+                SerialPortCombobox.BeginUpdate();
+                try
+                {
+                    SerialPortCombobox.Items.Clear();
+                    foreach (var portName in portNames)
+                    {
+                        var itemIndex = SerialPortCombobox.Items.Add(portName);
+
+                        if (portName == settings.SerialPort)
+                            SerialPortCombobox.SelectedIndex = itemIndex;
+                    }
+                }
+                finally
+                {
+                    SerialPortCombobox.EndUpdate();
+                }
+            });
+
+            return Task.CompletedTask;
+        }
+        
+        
+        private async Task LoadSettings()
+        {
+            var newSettings = await SettingsJsonSerializer.Deserialize();
+            SafeCall(() => SetSettings(newSettings));
+        }
+
+
+        private void SaveSettings()
+        {
+            if (settings == null)
+                return;
+            
+            Task.Run(async () =>
+            {
+                using (await saveSettingsLock.LockAsync())
+                { 
+                    await SettingsJsonSerializer.Serialize(settings);
+                }
+            });
+        }
+
+
+        private async Task Connect()
+        {
+            string serialPort = null;
+            
+            SafeCall(() =>
+            {
+                SerialPortStatusLabel.Text = Strings.StatusConnecting;
+                serialPort = (string)SerialPortCombobox.SelectedItem;
+            });
+
+            if (string.IsNullOrEmpty(serialPort))
+                return;
+
+            if (hardware != null)
+            {
+                hardware.DetachObserver(this);
+                await hardware.Disconnect();
+            }
+
+            hardware = massiveKnobHardwareFactory.Create(serialPort);
+            hardware.AttachObserver(this);
+
+            await hardware.TryConnect();
+        }
+
+
+        private async Task LoadAudioDevices()
+        {
+            var newDevices = await audioDeviceManager.GetDevices();
+            SafeCall(() => SetDevices(newDevices));
+        }
+
+
+
+        private void SetSettings(Settings.Settings value)
+        {
+            if (value == null)
+                return;
+
+            SerialPortCombobox.SelectedItem = value.SerialPort;
+            
+            // No need to update the knob device user controls, as they are not loaded yet
+
+            settings = value;
+        }
+
+        private void SetDevices(IEnumerable<IAudioDevice> value)
+        {
+            devices = value.ToArray();
+            
+            foreach (var knobDeviceControl in knobDeviceControls)
+                knobDeviceControl.SetDevices(devices);
+        }
+        
+        
+        private void SetKnobCount(int count)
+        {
+            if (count == knobDeviceControls.Count)
+                return;
+
+            SuspendLayout();
+            try
+            {
+                DeviceCountUnknownLabel.Visible = count == 0;
+
+                if (knobDeviceControls.Count > count)
+                {
+                    for (var i = count; i < knobDeviceControls.Count; i++)
+                        knobDeviceControls[i].Dispose();
+
+                    knobDeviceControls.RemoveRange(count, knobDeviceControls.Count - count);
+                }
+
+                for (var i = knobDeviceControls.Count; i < count; i++)
+                {
+                    var knobDeviceControl = new KnobDeviceControl
+                    {
+                        Left = 0,
+                        Width = DevicesPanel.Width
+                    };
+
+                    knobDeviceControl.Top = i * knobDeviceControl.Height;
+                    knobDeviceControl.Parent = DevicesPanel;
+
+                    knobDeviceControl.SetKnobIndex(i);
+                    knobDeviceControl.SetDevices(devices);
+
+                    if (i < settings.Knobs.Count)
+                        knobDeviceControl.SetDeviceId(settings.Knobs[i].DeviceId);
+
+                    knobDeviceControl.OnDeviceChanged += (sender, args) =>
+                    {
+                        while (settings.Knobs.Count - 1 < args.KnobIndex)
+                            settings.Knobs.Add(new Settings.Settings.KnobSettings());
+
+                        settings.Knobs[args.KnobIndex].DeviceId = args.DeviceId;
+                        SaveSettings();
+                    };
+
+                    knobDeviceControls.Add(knobDeviceControl);
+                }
+
+
+                var expectedHeight = knobDeviceControls.Count > 0
+                    ? knobDeviceControls[0].Height * count
+                    : DeviceCountUnknownLabel.Height;
+
+                if (expectedHeight == DevicesPanel.Height)
+                    return;
+
+                var diff = expectedHeight - DevicesPanel.Height;
+                Height += diff;
+                Top -= diff / 2;
+            }
+            finally
+            {
+                ResumeLayout();
+            }
+        }
+
+
+        protected override void SetVisibleCore(bool value)
+        {
+            // Prevent the form from showing at startup
+            if (!startupVisibleCalled)
+                startupVisibleCalled = true;
+            else
+                base.SetVisibleCore(value);
+        }
+
+
+        private void Settings()
+        {
+            Show();
+        }
+        
+        
+        private void Quit()
+        {
+            closing = true;
+            Close();
+        }
+
+
+        public void Connected(int knobCount)
+        {
+            SafeCall(() =>
+            {
+                SerialPortStatusLabel.Text = Strings.StatusConnected;
+                SetKnobCount(knobCount);
+            });
+        }
+        
+
+        public void Disconnected()
+        {
+            SafeCall(() =>
+            {
+                SerialPortStatusLabel.Text = Strings.StatusNotConnected;
+            });
+        }
+
+
+        public void VolumeChanged(int knob, int volume)
+        {
+            if (knob >= settings.Knobs.Count)
+                return;
+
+            if (!settings.Knobs[knob].DeviceId.HasValue)
+                return;
+
+            var deviceId = settings.Knobs[knob].DeviceId.Value;
+
+            Task.Run(async () =>
+            {
+                using (await setVolumeLock.LockAsync())
+                {
+                    var device = await audioDeviceManager.GetDeviceById(deviceId);
+                    if (device != null)
+                        await device.SetVolume(volume);
+                }
+            });
+        }
+
+
+        private void SettingsForm_FormClosing(object sender, FormClosingEventArgs e)
+        {
+            if (closing) 
+                return;
+            
+            Hide();
+            e.Cancel = true;
+        }
+
+
+        private void SettingsForm_FormClosed(object sender, FormClosedEventArgs e)
+        {
+            foreach (var knobDeviceControl in knobDeviceControls)
+                knobDeviceControl.Dispose();
+
+            knobDeviceControls.Clear();
+            
+
+            hardware?.DetachObserver(this);
+            hardware?.Disconnect().GetAwaiter().GetResult();
+            audioDeviceManager?.Dispose();
+        }        
+        
+        
+        private void NotifyIcon_DoubleClick(object sender, EventArgs e)
+        {
+            Settings();
+        }
+
+        
+        private void QuitToolStripMenuItem_Click(object sender, EventArgs e)
+        {
+            Quit();
+        }
+
+        
+        private void SettingsToolStripMenuItem_Click(object sender, EventArgs e)
+        {
+            Settings();
+        }
+
+        
+        private void CloseButton_Click(object sender, EventArgs e)
+        {
+            Close();
+        }
+
+        
+        private void SerialPortCombobox_SelectedIndexChanged(object sender, EventArgs e)
+        {
+            if (loading || (string)SerialPortCombobox.SelectedItem == settings.SerialPort)
+                return;
+            
+            settings.SerialPort = (string) SerialPortCombobox.SelectedItem;
+            SaveSettings();
+
+            Task.Run(Connect);
+        }
+    }
+}

Windows/Hardware/AbstractMassiveKnobHardware.cs

@@ -0,0 +1,62 @@
+using System.Collections.Generic;
+using System.Threading.Tasks;
+
+namespace MassiveKnob.Hardware
+{
+    public abstract class AbstractMassiveKnobHardware : IMassiveKnobHardware
+    {
+        protected ObserverProxy Observers = new ObserverProxy();
+        
+        public void AttachObserver(IMassiveKnobHardwareObserver observer)
+        {
+            Observers.AttachObserver(observer);
+        }
+
+        public void DetachObserver(IMassiveKnobHardwareObserver observer)
+        {
+            Observers.DetachObserver(observer);
+        }
+
+
+        public abstract Task TryConnect();
+        public abstract Task Disconnect();
+
+
+        public class ObserverProxy : IMassiveKnobHardwareObserver
+        {
+            private readonly List<IMassiveKnobHardwareObserver> observers = new List<IMassiveKnobHardwareObserver>();
+
+            
+            public void AttachObserver(IMassiveKnobHardwareObserver observer)
+            {
+                observers.Add(observer);
+            }
+
+            public void DetachObserver(IMassiveKnobHardwareObserver observer)
+            {
+                observers.Remove(observer);
+            }
+            
+
+            public void Connected(int knobCount)
+            {
+                foreach (var observer in observers)
+                    observer.Connected(knobCount);
+            }
+            
+
+            public void Disconnected()
+            {
+                foreach (var observer in observers)
+                    observer.Disconnected();
+            }
+
+
+            public void VolumeChanged(int knob, int volume)
+            {
+                foreach (var observer in observers)
+                    observer.VolumeChanged(knob, volume);
+            }
+        }
+    }
+}

Windows/Hardware/CoreAudioDeviceManager.cs

@@ -0,0 +1,82 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading.Tasks;
+using AudioSwitcher.AudioApi;
+using AudioSwitcher.AudioApi.CoreAudio;
+
+namespace MassiveKnob.Hardware
+{
+    public class CoreAudioDeviceManager : IAudioDeviceManager
+    {
+        private readonly Lazy<CoreAudioController> audioController = new Lazy<CoreAudioController>();
+        private List<IAudioDevice> devices;
+
+
+        public void Dispose()
+        {
+            if (audioController.IsValueCreated)
+                audioController.Value.Dispose();
+        }
+
+        
+        public async Task<IEnumerable<IAudioDevice>> GetDevices()
+        {
+            return devices ?? (devices = (await audioController.Value.GetPlaybackDevicesAsync())
+                .Select(device => new AudioDevice(device) as IAudioDevice)
+                .ToList());
+        }
+
+        
+        public Task<IAudioDevice> GetDeviceById(Guid deviceId)
+        {
+            return Task.FromResult(devices?.FirstOrDefault(device => device.Id == deviceId));
+        }
+
+
+        private class AudioDevice : IAudioDevice
+        {
+            private readonly IDevice device;
+
+            public Guid Id { get; }
+            public string DisplayName { get; }
+
+
+            public AudioDevice(IDevice device)
+            {
+                this.device = device;
+                Id = device.Id;
+                
+                string displayFormat;
+
+                if ((device.State & DeviceState.Disabled) != 0)
+                    displayFormat = Strings.DeviceDisplayNameDisabled;
+                else if ((device.State & DeviceState.Unplugged) != 0)
+                    displayFormat = Strings.DeviceDisplayNameUnplugged;
+                else if ((device.State & DeviceState.NotPresent) != 0)
+                    displayFormat = Strings.DeviceDisplayNameNotPresent;
+                else if ((device.State & DeviceState.Active) == 0)
+                    displayFormat = Strings.DeviceDisplayNameInactive;
+                else
+                    displayFormat = Strings.DeviceDisplayNameActive;
+
+                DisplayName = string.Format(displayFormat, device.FullName);
+            }
+
+
+            public Task SetVolume(int volume)
+            {
+                return device.SetVolumeAsync(volume);
+            }
+        }
+    }
+
+
+    public class CoreAudioDeviceManagerFactory : IAudioDeviceManagerFactory
+    {
+        public IAudioDeviceManager Create()
+        {
+            return new CoreAudioDeviceManager();
+        }
+    }
+}

Windows/Hardware/IAudioDeviceManager.cs

@@ -0,0 +1,27 @@
+using System;
+using System.Collections.Generic;
+using System.Threading.Tasks;
+
+namespace MassiveKnob.Hardware
+{
+    public interface IAudioDevice
+    {
+        Guid Id { get; }
+        string DisplayName { get; }
+
+        Task SetVolume(int volume);
+    }
+    
+    
+    public interface IAudioDeviceManager : IDisposable
+    {
+        Task<IEnumerable<IAudioDevice>> GetDevices();
+        Task<IAudioDevice> GetDeviceById(Guid deviceId);
+    }
+
+
+    public interface IAudioDeviceManagerFactory
+    {
+        IAudioDeviceManager Create();
+    }
+}

Windows/Hardware/IMassiveKnobHardware.cs

@@ -0,0 +1,30 @@
+using System.Threading.Tasks;
+
+namespace MassiveKnob.Hardware
+{
+    public interface IMassiveKnobHardwareObserver
+    {
+        void Connected(int knobCount);
+        void Disconnected();
+
+        void VolumeChanged(int knob, int volume);
+        // void ButtonPress(int index); -- for switching the active device, TBD
+    }
+
+
+    public interface IMassiveKnobHardware
+    {
+        void AttachObserver(IMassiveKnobHardwareObserver observer);
+        void DetachObserver(IMassiveKnobHardwareObserver observer);
+
+        Task TryConnect();
+        Task Disconnect();
+        // Task SetActiveKnob(int knob); -- for providing LED feedback when switching the active device, TBD
+    }
+
+
+    public interface IMassiveKnobHardwareFactory
+    {
+        IMassiveKnobHardware Create(string serialPort);
+    }
+}

Windows/Hardware/MockMassiveKnobHardware.cs

@@ -0,0 +1,70 @@
+using System;
+using System.Threading;
+using System.Threading.Tasks;
+
+namespace MassiveKnob.Hardware
+{
+    public class MockMassiveKnobHardware : AbstractMassiveKnobHardware
+    {
+        private readonly int knobCount;
+        private readonly TimeSpan volumeChangeInterval;
+        private readonly int maxVolume;
+        private Timer changeVolumeTimer;
+        private readonly Random random = new Random();
+
+        
+        public MockMassiveKnobHardware(int knobCount, TimeSpan volumeChangeInterval, int maxVolume)
+        {
+            this.knobCount = knobCount;
+            this.volumeChangeInterval = volumeChangeInterval;
+            this.maxVolume = maxVolume;
+        }
+        
+        
+        public override async Task TryConnect()
+        {
+            if (changeVolumeTimer != null)
+                return;
+            
+            await Task.Delay(2000);
+            
+            Observers.Connected(knobCount);
+            changeVolumeTimer = new Timer(
+                state =>
+                {
+                    Observers.VolumeChanged(random.Next(0, knobCount), random.Next(0, maxVolume));
+                },
+                null,
+                volumeChangeInterval,
+                volumeChangeInterval);
+        }
+        
+
+        public override Task Disconnect()
+        {
+            changeVolumeTimer?.Dispose();
+            return Task.CompletedTask;
+        }
+    }
+    
+    
+    public class MockMassiveKnobHardwareFactory : IMassiveKnobHardwareFactory
+    {
+        private readonly int knobCount;
+        private readonly TimeSpan volumeChangeInterval;
+        private readonly int maxVolume;
+
+        public MockMassiveKnobHardwareFactory(int knobCount, TimeSpan volumeChangeInterval, int maxVolume)
+        {
+            this.knobCount = knobCount;
+            this.volumeChangeInterval = volumeChangeInterval;
+            this.maxVolume = maxVolume;
+        }
+        
+        
+        public IMassiveKnobHardware Create(string serialPort)
+        {
+            return new MockMassiveKnobHardware(knobCount, volumeChangeInterval, maxVolume);
+        }
+    }
+}

Windows/MassiveKnob.csproj

@@ -0,0 +1,134 @@
+<?xml version="1.0" encoding="utf-8"?>
+<Project ToolsVersion="15.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <Import Project="$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props" Condition="Exists('$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props')" />
+  <PropertyGroup>
+    <Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>
+    <Platform Condition=" '$(Platform)' == '' ">AnyCPU</Platform>
+    <ProjectGuid>{73130EC7-49B3-40AD-8367-1095C0F41905}</ProjectGuid>
+    <OutputType>WinExe</OutputType>
+    <RootNamespace>MassiveKnob</RootNamespace>
+    <AssemblyName>MassiveKnob</AssemblyName>
+    <TargetFrameworkVersion>v4.7.2</TargetFrameworkVersion>
+    <FileAlignment>512</FileAlignment>
+    <AutoGenerateBindingRedirects>true</AutoGenerateBindingRedirects>
+    <Deterministic>true</Deterministic>
+  </PropertyGroup>
+  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' ">
+    <PlatformTarget>AnyCPU</PlatformTarget>
+    <DebugSymbols>true</DebugSymbols>
+    <DebugType>full</DebugType>
+    <Optimize>false</Optimize>
+    <OutputPath>bin\Debug\</OutputPath>
+    <DefineConstants>DEBUG;TRACE</DefineConstants>
+    <ErrorReport>prompt</ErrorReport>
+    <WarningLevel>4</WarningLevel>
+    <Prefer32Bit>false</Prefer32Bit>
+  </PropertyGroup>
+  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|AnyCPU' ">
+    <PlatformTarget>AnyCPU</PlatformTarget>
+    <DebugType>pdbonly</DebugType>
+    <Optimize>true</Optimize>
+    <OutputPath>bin\Release\</OutputPath>
+    <DefineConstants>TRACE</DefineConstants>
+    <ErrorReport>prompt</ErrorReport>
+    <WarningLevel>4</WarningLevel>
+    <Prefer32Bit>false</Prefer32Bit>
+  </PropertyGroup>
+  <PropertyGroup>
+    <ApplicationIcon>MainIcon.ico</ApplicationIcon>
+  </PropertyGroup>
+  <PropertyGroup>
+    <StartupObject>MassiveKnob.Program</StartupObject>
+  </PropertyGroup>
+  <ItemGroup>
+    <Reference Include="System" />
+    <Reference Include="System.Core" />
+    <Reference Include="System.Xml.Linq" />
+    <Reference Include="System.Data.DataSetExtensions" />
+    <Reference Include="Microsoft.CSharp" />
+    <Reference Include="System.Data" />
+    <Reference Include="System.Deployment" />
+    <Reference Include="System.Drawing" />
+    <Reference Include="System.Net.Http" />
+    <Reference Include="System.Windows.Forms" />
+    <Reference Include="System.Xml" />
+  </ItemGroup>
+  <ItemGroup>
+    <Compile Include="Forms\SettingsForm.cs">
+      <SubType>Form</SubType>
+    </Compile>
+    <Compile Include="Forms\SettingsForm.Designer.cs">
+      <DependentUpon>SettingsForm.cs</DependentUpon>
+    </Compile>
+    <Compile Include="Hardware\AbstractMassiveKnobHardware.cs" />
+    <Compile Include="Hardware\CoreAudioDeviceManager.cs" />
+    <Compile Include="Hardware\IAudioDeviceManager.cs" />
+    <Compile Include="Hardware\IMassiveKnobHardware.cs" />
+    <Compile Include="Hardware\MockMassiveKnobHardware.cs" />
+    <Compile Include="Program.cs" />
+    <Compile Include="Properties\AssemblyInfo.cs" />
+    <Compile Include="Settings\Settings.cs" />
+    <Compile Include="Settings\SettingsJsonSerializer.cs" />
+    <Compile Include="Strings.Designer.cs">
+      <AutoGen>True</AutoGen>
+      <DesignTime>True</DesignTime>
+      <DependentUpon>Strings.resx</DependentUpon>
+    </Compile>
+    <Compile Include="UserControls\KnobDeviceControl.cs">
+      <SubType>UserControl</SubType>
+    </Compile>
+    <Compile Include="UserControls\KnobDeviceControl.Designer.cs">
+      <DependentUpon>KnobDeviceControl.cs</DependentUpon>
+    </Compile>
+    <EmbeddedResource Include="Forms\SettingsForm.resx">
+      <DependentUpon>SettingsForm.cs</DependentUpon>
+    </EmbeddedResource>
+    <EmbeddedResource Include="Properties\Resources.resx">
+      <Generator>ResXFileCodeGenerator</Generator>
+      <LastGenOutput>Resources.Designer.cs</LastGenOutput>
+      <SubType>Designer</SubType>
+    </EmbeddedResource>
+    <Compile Include="Properties\Resources.Designer.cs">
+      <AutoGen>True</AutoGen>
+      <DependentUpon>Resources.resx</DependentUpon>
+    </Compile>
+    <EmbeddedResource Include="Strings.resx">
+      <Generator>ResXFileCodeGenerator</Generator>
+      <LastGenOutput>Strings.Designer.cs</LastGenOutput>
+    </EmbeddedResource>
+    <None Include="Properties\Settings.settings">
+      <Generator>SettingsSingleFileGenerator</Generator>
+      <LastGenOutput>Settings.Designer.cs</LastGenOutput>
+    </None>
+    <Compile Include="Properties\Settings.Designer.cs">
+      <AutoGen>True</AutoGen>
+      <DependentUpon>Settings.settings</DependentUpon>
+      <DesignTimeSharedInput>True</DesignTimeSharedInput>
+    </Compile>
+  </ItemGroup>
+  <ItemGroup>
+    <None Include="App.config" />
+  </ItemGroup>
+  <ItemGroup>
+    <PackageReference Include="AudioSwitcher.AudioApi">
+      <Version>4.0.0-alpha5</Version>
+    </PackageReference>
+    <PackageReference Include="AudioSwitcher.AudioApi.CoreAudio">
+      <Version>4.0.0-alpha5</Version>
+    </PackageReference>
+    <PackageReference Include="Newtonsoft.Json">
+      <Version>12.0.3</Version>
+    </PackageReference>
+    <PackageReference Include="Nito.AsyncEx">
+      <Version>5.1.0</Version>
+    </PackageReference>
+    <PackageReference Include="SimpleInjector">
+      <Version>5.2.1</Version>
+    </PackageReference>
+  </ItemGroup>
+  <ItemGroup>
+    <Content Include="MainIcon.ico" />
+  </ItemGroup>
+  <ItemGroup />
+  <Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />
+</Project>

Windows/MassiveKnob.sln

@@ -0,0 +1,25 @@
+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 16
+VisualStudioVersion = 16.0.31005.135
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "MassiveKnob", "MassiveKnob.csproj", "{73130EC7-49B3-40AD-8367-1095C0F41905}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{73130EC7-49B3-40AD-8367-1095C0F41905}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{73130EC7-49B3-40AD-8367-1095C0F41905}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{73130EC7-49B3-40AD-8367-1095C0F41905}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{73130EC7-49B3-40AD-8367-1095C0F41905}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {3063D7FD-6457-45B0-9ED8-620BDF605773}
+	EndGlobalSection
+EndGlobal

Windows/Program.cs

@@ -0,0 +1,43 @@
+using System;
+using System.Windows.Forms;
+using MassiveKnob.Forms;
+using MassiveKnob.Hardware;
+using SimpleInjector;
+using SimpleInjector.Diagnostics;
+
+namespace MassiveKnob
+{
+    public static class Program
+    {
+        /// <summary>
+        /// The main entry point for the application.
+        /// </summary>
+        [STAThread]
+        public static void Main()
+        {
+            var container = BuildContainer();
+            
+            Application.EnableVisualStyles();
+            Application.SetCompatibleTextRenderingDefault(false);
+            Application.Run(container.GetInstance<SettingsForm>());
+        }
+
+
+        private static Container BuildContainer()
+        {
+            var container = new Container();
+            container.Options.EnableAutoVerification = false;
+            
+            container.Register<SettingsForm>();
+            container.GetRegistration(typeof(SettingsForm))?.Registration
+                .SuppressDiagnosticWarning(DiagnosticType.DisposableTransientComponent, "Windows Form implements IDisposable");
+
+            container.Register<IAudioDeviceManagerFactory, CoreAudioDeviceManagerFactory>();
+            
+            // For testing without the hardware:
+            container.Register<IMassiveKnobHardwareFactory>(() => new MockMassiveKnobHardwareFactory(3, TimeSpan.FromSeconds(1), 25));
+            
+            return container;
+        }
+    }
+}

Windows/Properties/AssemblyInfo.cs

@@ -0,0 +1,35 @@
+using System.Reflection;
+using System.Runtime.InteropServices;
+
+// General Information about an assembly is controlled through the following
+// set of attributes. Change these attribute values to modify the information
+// associated with an assembly.
+[assembly: AssemblyTitle("MassiveKnob")]
+[assembly: AssemblyDescription("Physical controls for Windows audio devices")]
+[assembly: AssemblyConfiguration("")]
+[assembly: AssemblyCompany("")]
+[assembly: AssemblyProduct("MassiveKnob")]
+[assembly: AssemblyCopyright("Copyright © 2021 Mark van Renswoude")]
+[assembly: AssemblyTrademark("")]
+[assembly: AssemblyCulture("")]
+
+// Setting ComVisible to false makes the types in this assembly not visible
+// to COM components.  If you need to access a type in this assembly from
+// COM, set the ComVisible attribute to true on that type.
+[assembly: ComVisible(false)]
+
+// The following GUID is for the ID of the typelib if this project is exposed to COM
+[assembly: Guid("73130ec7-49b3-40ad-8367-1095c0f41905")]
+
+// Version information for an assembly consists of the following four values:
+//
+//      Major Version
+//      Minor Version
+//      Build Number
+//      Revision
+//
+// You can specify all the values or you can default the Build and Revision Numbers
+// by using the '*' as shown below:
+// [assembly: AssemblyVersion("1.0.*")]
+[assembly: AssemblyVersion("1.0.0.0")]
+[assembly: AssemblyFileVersion("1.0.0.0")]

Windows/Properties/Resources.Designer.cs

@@ -0,0 +1,70 @@
+//------------------------------------------------------------------------------
+// <auto-generated>
+//     This code was generated by a tool.
+//     Runtime Version:4.0.30319.42000
+//
+//     Changes to this file may cause incorrect behavior and will be lost if
+//     the code is regenerated.
+// </auto-generated>
+//------------------------------------------------------------------------------
+
+
+namespace MassiveKnob.Properties
+{
+    /// <summary>
+    ///   A strongly-typed resource class, for looking up localized strings, etc.
+    /// </summary>
+    // This class was auto-generated by the StronglyTypedResourceBuilder
+    // class via a tool like ResGen or Visual Studio.
+    // To add or remove a member, edit your .ResX file then rerun ResGen
+    // with the /str option, or rebuild your VS project.
+    [global::System.CodeDom.Compiler.GeneratedCodeAttribute("System.Resources.Tools.StronglyTypedResourceBuilder", "4.0.0.0")]
+    [global::System.Diagnostics.DebuggerNonUserCodeAttribute()]
+    [global::System.Runtime.CompilerServices.CompilerGeneratedAttribute()]
+    internal class Resources
+    {
+
+        private static global::System.Resources.ResourceManager resourceMan;
+
+        private static global::System.Globalization.CultureInfo resourceCulture;
+
+        [global::System.Diagnostics.CodeAnalysis.SuppressMessageAttribute("Microsoft.Performance", "CA1811:AvoidUncalledPrivateCode")]
+        internal Resources()
+        {
+        }
+
+        /// <summary>
+        ///   Returns the cached ResourceManager instance used by this class.
+        /// </summary>
+        [global::System.ComponentModel.EditorBrowsableAttribute(global::System.ComponentModel.EditorBrowsableState.Advanced)]
+        internal static global::System.Resources.ResourceManager ResourceManager
+        {
+            get
+            {
+                if ((resourceMan == null))
+                {
+                    global::System.Resources.ResourceManager temp = new global::System.Resources.ResourceManager("MassiveKnob.Properties.Resources", typeof(Resources).Assembly);
+                    resourceMan = temp;
+                }
+                return resourceMan;
+            }
+        }
+
+        /// <summary>
+        ///   Overrides the current thread's CurrentUICulture property for all
+        ///   resource lookups using this strongly typed resource class.
+        /// </summary>
+        [global::System.ComponentModel.EditorBrowsableAttribute(global::System.ComponentModel.EditorBrowsableState.Advanced)]
+        internal static global::System.Globalization.CultureInfo Culture
+        {
+            get
+            {
+                return resourceCulture;
+            }
+            set
+            {
+                resourceCulture = value;
+            }
+        }
+    }
+}

Windows/Properties/Resources.resx

@@ -0,0 +1,117 @@
+<?xml version="1.0" encoding="utf-8"?>
+<root>
+  <!-- 
+    Microsoft ResX Schema 
+    
+    Version 2.0
+    
+    The primary goals of this format is to allow a simple XML format 
+    that is mostly human readable. The generation and parsing of the 
+    various data types are done through the TypeConverter classes 
+    associated with the data types.
+    
+    Example:
+    
+    ... ado.net/XML headers & schema ...
+    <resheader name="resmimetype">text/microsoft-resx</resheader>
+    <resheader name="version">2.0</resheader>
+    <resheader name="reader">System.Resources.ResXResourceReader, System.Windows.Forms, ...</resheader>
+    <resheader name="writer">System.Resources.ResXResourceWriter, System.Windows.Forms, ...</resheader>
+    <data name="Name1"><value>this is my long string</value><comment>this is a comment</comment></data>
+    <data name="Color1" type="System.Drawing.Color, System.Drawing">Blue</data>
+    <data name="Bitmap1" mimetype="application/x-microsoft.net.object.binary.base64">
+        <value>[base64 mime encoded serialized .NET Framework object]</value>
+    </data>
+    <data name="Icon1" type="System.Drawing.Icon, System.Drawing" mimetype="application/x-microsoft.net.object.bytearray.base64">
+        <value>[base64 mime encoded string representing a byte array form of the .NET Framework object]</value>
+        <comment>This is a comment</comment>
+    </data>
+                
+    There are any number of "resheader" rows that contain simple 
+    name/value pairs.
+    
+    Each data row contains a name, and value. The row also contains a 
+    type or mimetype. Type corresponds to a .NET class that support 
+    text/value conversion through the TypeConverter architecture. 
+    Classes that don't support this are serialized and stored with the 
+    mimetype set.
+    
+    The mimetype is used for serialized objects, and tells the 
+    ResXResourceReader how to depersist the object. This is currently not 
+    extensible. For a given mimetype the value must be set accordingly:
+    
+    Note - application/x-microsoft.net.object.binary.base64 is the format 
+    that the ResXResourceWriter will generate, however the reader can 
+    read any of the formats listed below.
+    
+    mimetype: application/x-microsoft.net.object.binary.base64
+    value   : The object must be serialized with 
+            : System.Serialization.Formatters.Binary.BinaryFormatter
+            : and then encoded with base64 encoding.
+    
+    mimetype: application/x-microsoft.net.object.soap.base64
+    value   : The object must be serialized with 
+            : System.Runtime.Serialization.Formatters.Soap.SoapFormatter
+            : and then encoded with base64 encoding.
+
+    mimetype: application/x-microsoft.net.object.bytearray.base64
+    value   : The object must be serialized into a byte array 
+            : using a System.ComponentModel.TypeConverter
+            : and then encoded with base64 encoding.
+    -->
+  <xsd:schema id="root" xmlns="" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:msdata="urn:schemas-microsoft-com:xml-msdata">
+    <xsd:element name="root" msdata:IsDataSet="true">
+      <xsd:complexType>
+        <xsd:choice maxOccurs="unbounded">
+          <xsd:element name="metadata">
+            <xsd:complexType>
+              <xsd:sequence>
+                <xsd:element name="value" type="xsd:string" minOccurs="0" />
+              </xsd:sequence>
+              <xsd:attribute name="name" type="xsd:string" />
+              <xsd:attribute name="type" type="xsd:string" />
+              <xsd:attribute name="mimetype" type="xsd:string" />
+            </xsd:complexType>
+          </xsd:element>
+          <xsd:element name="assembly">
+            <xsd:complexType>
+              <xsd:attribute name="alias" type="xsd:string" />
+              <xsd:attribute name="name" type="xsd:string" />
+            </xsd:complexType>
+          </xsd:element>
+          <xsd:element name="data">
+            <xsd:complexType>
+              <xsd:sequence>
+                <xsd:element name="value" type="xsd:string" minOccurs="0" msdata:Ordinal="1" />
+                <xsd:element name="comment" type="xsd:string" minOccurs="0" msdata:Ordinal="2" />
+              </xsd:sequence>
+              <xsd:attribute name="name" type="xsd:string" msdata:Ordinal="1" />
+              <xsd:attribute name="type" type="xsd:string" msdata:Ordinal="3" />
+              <xsd:attribute name="mimetype" type="xsd:string" msdata:Ordinal="4" />
+            </xsd:complexType>
+          </xsd:element>
+          <xsd:element name="resheader">
+            <xsd:complexType>
+              <xsd:sequence>
+                <xsd:element name="value" type="xsd:string" minOccurs="0" msdata:Ordinal="1" />
+              </xsd:sequence>
+              <xsd:attribute name="name" type="xsd:string" use="required" />
+            </xsd:complexType>
+          </xsd:element>
+        </xsd:choice>
+      </xsd:complexType>
+    </xsd:element>
+  </xsd:schema>
+  <resheader name="resmimetype">
+    <value>text/microsoft-resx</value>
+  </resheader>
+  <resheader name="version">
+    <value>2.0</value>
+  </resheader>
+  <resheader name="reader">
+    <value>System.Resources.ResXResourceReader, System.Windows.Forms, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</value>
+  </resheader>
+  <resheader name="writer">
+    <value>System.Resources.ResXResourceWriter, System.Windows.Forms, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</value>
+  </resheader>
+</root>

Windows/Properties/Settings.Designer.cs

@@ -0,0 +1,29 @@
+//------------------------------------------------------------------------------
+// <auto-generated>
+//     This code was generated by a tool.
+//     Runtime Version:4.0.30319.42000
+//
+//     Changes to this file may cause incorrect behavior and will be lost if
+//     the code is regenerated.
+// </auto-generated>
+//------------------------------------------------------------------------------
+
+
+namespace MassiveKnob.Properties
+{
+    [global::System.Runtime.CompilerServices.CompilerGeneratedAttribute()]
+    [global::System.CodeDom.Compiler.GeneratedCodeAttribute("Microsoft.VisualStudio.Editors.SettingsDesigner.SettingsSingleFileGenerator", "11.0.0.0")]
+    internal sealed partial class Settings : global::System.Configuration.ApplicationSettingsBase
+    {
+
+        private static Settings defaultInstance = ((Settings)(global::System.Configuration.ApplicationSettingsBase.Synchronized(new Settings())));
+
+        public static Settings Default
+        {
+            get
+            {
+                return defaultInstance;
+            }
+        }
+    }
+}

Windows/Properties/Settings.settings

@@ -0,0 +1,7 @@
+<?xml version='1.0' encoding='utf-8'?>
+<SettingsFile xmlns="http://schemas.microsoft.com/VisualStudio/2004/01/settings" CurrentProfile="(Default)">
+  <Profiles>
+    <Profile Name="(Default)" />
+  </Profiles>
+  <Settings />
+</SettingsFile>

Windows/Settings/Settings.cs

@@ -0,0 +1,26 @@
+using System;
+using System.Collections.Generic;
+
+namespace MassiveKnob.Settings
+{
+    public class Settings
+    {
+        public string SerialPort { get; set; }
+        public List<KnobSettings> Knobs { get; set; }
+        
+        
+        public static Settings Default()
+        {
+            return new Settings
+            {
+                Knobs = new List<KnobSettings>()
+            };
+        }
+
+
+        public class KnobSettings
+        {
+            public Guid? DeviceId { get; set; }
+        }
+    }
+}

Windows/Settings/SettingsJsonSerializer.cs

@@ -0,0 +1,106 @@
+using System;
+using System.IO;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using Newtonsoft.Json;
+
+namespace MassiveKnob.Settings
+{
+    public static class SettingsJsonSerializer
+    {
+        public static string GetDefaultFilename()
+        {
+            var path = Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.LocalApplicationData), @"MassiveKnob");
+            Directory.CreateDirectory(path);
+
+            return Path.Combine(path, "Settings.json");
+        }
+        
+        
+        public static Task Serialize(Settings settings)
+        {
+            return Serialize(settings, GetDefaultFilename());
+        }
+
+        public static async Task Serialize(Settings settings, string filename)
+        {
+            var serializedSettings = SerializedSettings.FromSettings(settings);
+            var json = JsonConvert.SerializeObject(serializedSettings);
+
+            using (var stream = new FileStream(filename, FileMode.Create, FileAccess.Write, FileShare.Read, 4096, true))
+            using (var streamWriter = new StreamWriter(stream, Encoding.UTF8))
+            {
+                await streamWriter.WriteAsync(json);
+                await streamWriter.FlushAsync();
+            }
+        }
+
+
+        public static Task<Settings> Deserialize()
+        {
+            return Deserialize(GetDefaultFilename());
+        }
+
+        public static async Task<Settings> Deserialize(string filename)
+        {
+            if (!File.Exists(filename))
+                return Settings.Default();
+
+            string json;
+
+            using (var stream = new FileStream(filename, FileMode.Open, FileAccess.Read, FileShare.ReadWrite, 4096, true))
+            using (var streamReader = new StreamReader(stream, Encoding.UTF8))
+            {
+                json = await streamReader.ReadToEndAsync();
+            }
+
+            if (string.IsNullOrEmpty(json))
+                return Settings.Default();
+
+            var serializedSettings = JsonConvert.DeserializeObject<SerializedSettings>(json);
+            return serializedSettings.ToSettings();
+        }
+
+
+        private class SerializedSettings
+        {
+            // ReSharper disable MemberCanBePrivate.Local - used for JSON serialization
+            public string SerialPort;
+            public SerializedKnobSettings[] Knobs;
+            // ReSharper restore MemberCanBePrivate.Local
+
+
+            public static SerializedSettings FromSettings(Settings settings)
+            {
+                return new SerializedSettings
+                {
+                    SerialPort = settings.SerialPort,
+                    Knobs = settings.Knobs.Select(knob => new SerializedKnobSettings
+                    {
+                        DeviceId = knob.DeviceId
+                    }).ToArray()
+                };
+            }
+
+            
+            public Settings ToSettings()
+            {
+                return new Settings
+                {
+                    SerialPort = SerialPort,
+                    Knobs = Knobs.Select(knob => new Settings.KnobSettings
+                    {
+                        DeviceId = knob.DeviceId
+                    }).ToList()
+                };
+            }
+            
+
+            public class SerializedKnobSettings
+            {
+                public Guid? DeviceId;
+            }
+        }
+    }
+}

Windows/Strings.Designer.cs

@@ -0,0 +1,144 @@
+//------------------------------------------------------------------------------
+// <auto-generated>
+//     This code was generated by a tool.
+//     Runtime Version:4.0.30319.42000
+//
+//     Changes to this file may cause incorrect behavior and will be lost if
+//     the code is regenerated.
+// </auto-generated>
+//------------------------------------------------------------------------------
+
+namespace MassiveKnob {
+    using System;
+    
+    
+    /// <summary>
+    ///   A strongly-typed resource class, for looking up localized strings, etc.
+    /// </summary>
+    // This class was auto-generated by the StronglyTypedResourceBuilder
+    // class via a tool like ResGen or Visual Studio.
+    // To add or remove a member, edit your .ResX file then rerun ResGen
+    // with the /str option, or rebuild your VS project.
+    [global::System.CodeDom.Compiler.GeneratedCodeAttribute("System.Resources.Tools.StronglyTypedResourceBuilder", "16.0.0.0")]
+    [global::System.Diagnostics.DebuggerNonUserCodeAttribute()]
+    [global::System.Runtime.CompilerServices.CompilerGeneratedAttribute()]
+    internal class Strings {
+        
+        private static global::System.Resources.ResourceManager resourceMan;
+        
+        private static global::System.Globalization.CultureInfo resourceCulture;
+        
+        [global::System.Diagnostics.CodeAnalysis.SuppressMessageAttribute("Microsoft.Performance", "CA1811:AvoidUncalledPrivateCode")]
+        internal Strings() {
+        }
+        
+        /// <summary>
+        ///   Returns the cached ResourceManager instance used by this class.
+        /// </summary>
+        [global::System.ComponentModel.EditorBrowsableAttribute(global::System.ComponentModel.EditorBrowsableState.Advanced)]
+        internal static global::System.Resources.ResourceManager ResourceManager {
+            get {
+                if (object.ReferenceEquals(resourceMan, null)) {
+                    global::System.Resources.ResourceManager temp = new global::System.Resources.ResourceManager("MassiveKnob.Strings", typeof(Strings).Assembly);
+                    resourceMan = temp;
+                }
+                return resourceMan;
+            }
+        }
+        
+        /// <summary>
+        ///   Overrides the current thread's CurrentUICulture property for all
+        ///   resource lookups using this strongly typed resource class.
+        /// </summary>
+        [global::System.ComponentModel.EditorBrowsableAttribute(global::System.ComponentModel.EditorBrowsableState.Advanced)]
+        internal static global::System.Globalization.CultureInfo Culture {
+            get {
+                return resourceCulture;
+            }
+            set {
+                resourceCulture = value;
+            }
+        }
+        
+        /// <summary>
+        ///   Looks up a localized string similar to {0}.
+        /// </summary>
+        internal static string DeviceDisplayNameActive {
+            get {
+                return ResourceManager.GetString("DeviceDisplayNameActive", resourceCulture);
+            }
+        }
+        
+        /// <summary>
+        ///   Looks up a localized string similar to {0} (Disabled).
+        /// </summary>
+        internal static string DeviceDisplayNameDisabled {
+            get {
+                return ResourceManager.GetString("DeviceDisplayNameDisabled", resourceCulture);
+            }
+        }
+        
+        /// <summary>
+        ///   Looks up a localized string similar to {0} (Inactive).
+        /// </summary>
+        internal static string DeviceDisplayNameInactive {
+            get {
+                return ResourceManager.GetString("DeviceDisplayNameInactive", resourceCulture);
+            }
+        }
+        
+        /// <summary>
+        ///   Looks up a localized string similar to {0} (Not present).
+        /// </summary>
+        internal static string DeviceDisplayNameNotPresent {
+            get {
+                return ResourceManager.GetString("DeviceDisplayNameNotPresent", resourceCulture);
+            }
+        }
+        
+        /// <summary>
+        ///   Looks up a localized string similar to {0} (Unplugged).
+        /// </summary>
+        internal static string DeviceDisplayNameUnplugged {
+            get {
+                return ResourceManager.GetString("DeviceDisplayNameUnplugged", resourceCulture);
+            }
+        }
+        
+        /// <summary>
+        ///   Looks up a localized string similar to Knob {0}.
+        /// </summary>
+        internal static string KnobIndex {
+            get {
+                return ResourceManager.GetString("KnobIndex", resourceCulture);
+            }
+        }
+        
+        /// <summary>
+        ///   Looks up a localized string similar to Connected.
+        /// </summary>
+        internal static string StatusConnected {
+            get {
+                return ResourceManager.GetString("StatusConnected", resourceCulture);
+            }
+        }
+        
+        /// <summary>
+        ///   Looks up a localized string similar to Connecting....
+        /// </summary>
+        internal static string StatusConnecting {
+            get {
+                return ResourceManager.GetString("StatusConnecting", resourceCulture);
+            }
+        }
+        
+        /// <summary>
+        ///   Looks up a localized string similar to Not connected.
+        /// </summary>
+        internal static string StatusNotConnected {
+            get {
+                return ResourceManager.GetString("StatusNotConnected", resourceCulture);
+            }
+        }
+    }
+}

Windows/Strings.resx

@@ -0,0 +1,147 @@
+<?xml version="1.0" encoding="utf-8"?>
+<root>
+  <!-- 
+    Microsoft ResX Schema 
+    
+    Version 2.0
+    
+    The primary goals of this format is to allow a simple XML format 
+    that is mostly human readable. The generation and parsing of the 
+    various data types are done through the TypeConverter classes 
+    associated with the data types.
+    
+    Example:
+    
+    ... ado.net/XML headers & schema ...
+    <resheader name="resmimetype">text/microsoft-resx</resheader>
+    <resheader name="version">2.0</resheader>
+    <resheader name="reader">System.Resources.ResXResourceReader, System.Windows.Forms, ...</resheader>
+    <resheader name="writer">System.Resources.ResXResourceWriter, System.Windows.Forms, ...</resheader>
+    <data name="Name1"><value>this is my long string</value><comment>this is a comment</comment></data>
+    <data name="Color1" type="System.Drawing.Color, System.Drawing">Blue</data>
+    <data name="Bitmap1" mimetype="application/x-microsoft.net.object.binary.base64">
+        <value>[base64 mime encoded serialized .NET Framework object]</value>
+    </data>
+    <data name="Icon1" type="System.Drawing.Icon, System.Drawing" mimetype="application/x-microsoft.net.object.bytearray.base64">
+        <value>[base64 mime encoded string representing a byte array form of the .NET Framework object]</value>
+        <comment>This is a comment</comment>
+    </data>
+                
+    There are any number of "resheader" rows that contain simple 
+    name/value pairs.
+    
+    Each data row contains a name, and value. The row also contains a 
+    type or mimetype. Type corresponds to a .NET class that support 
+    text/value conversion through the TypeConverter architecture. 
+    Classes that don't support this are serialized and stored with the 
+    mimetype set.
+    
+    The mimetype is used for serialized objects, and tells the 
+    ResXResourceReader how to depersist the object. This is currently not 
+    extensible. For a given mimetype the value must be set accordingly:
+    
+    Note - application/x-microsoft.net.object.binary.base64 is the format 
+    that the ResXResourceWriter will generate, however the reader can 
+    read any of the formats listed below.
+    
+    mimetype: application/x-microsoft.net.object.binary.base64
+    value   : The object must be serialized with 
+            : System.Runtime.Serialization.Formatters.Binary.BinaryFormatter
+            : and then encoded with base64 encoding.
+    
+    mimetype: application/x-microsoft.net.object.soap.base64
+    value   : The object must be serialized with 
+            : System.Runtime.Serialization.Formatters.Soap.SoapFormatter
+            : and then encoded with base64 encoding.
+
+    mimetype: application/x-microsoft.net.object.bytearray.base64
+    value   : The object must be serialized into a byte array 
+            : using a System.ComponentModel.TypeConverter
+            : and then encoded with base64 encoding.
+    -->
+  <xsd:schema id="root" xmlns="" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:msdata="urn:schemas-microsoft-com:xml-msdata">
+    <xsd:import namespace="http://www.w3.org/XML/1998/namespace" />
+    <xsd:element name="root" msdata:IsDataSet="true">
+      <xsd:complexType>
+        <xsd:choice maxOccurs="unbounded">
+          <xsd:element name="metadata">
+            <xsd:complexType>
+              <xsd:sequence>
+                <xsd:element name="value" type="xsd:string" minOccurs="0" />
+              </xsd:sequence>
+              <xsd:attribute name="name" use="required" type="xsd:string" />
+              <xsd:attribute name="type" type="xsd:string" />
+              <xsd:attribute name="mimetype" type="xsd:string" />
+              <xsd:attribute ref="xml:space" />
+            </xsd:complexType>
+          </xsd:element>
+          <xsd:element name="assembly">
+            <xsd:complexType>
+              <xsd:attribute name="alias" type="xsd:string" />
+              <xsd:attribute name="name" type="xsd:string" />
+            </xsd:complexType>
+          </xsd:element>
+          <xsd:element name="data">
+            <xsd:complexType>
+              <xsd:sequence>
+                <xsd:element name="value" type="xsd:string" minOccurs="0" msdata:Ordinal="1" />
+                <xsd:element name="comment" type="xsd:string" minOccurs="0" msdata:Ordinal="2" />
+              </xsd:sequence>
+              <xsd:attribute name="name" type="xsd:string" use="required" msdata:Ordinal="1" />
+              <xsd:attribute name="type" type="xsd:string" msdata:Ordinal="3" />
+              <xsd:attribute name="mimetype" type="xsd:string" msdata:Ordinal="4" />
+              <xsd:attribute ref="xml:space" />
+            </xsd:complexType>
+          </xsd:element>
+          <xsd:element name="resheader">
+            <xsd:complexType>
+              <xsd:sequence>
+                <xsd:element name="value" type="xsd:string" minOccurs="0" msdata:Ordinal="1" />
+              </xsd:sequence>
+              <xsd:attribute name="name" type="xsd:string" use="required" />
+            </xsd:complexType>
+          </xsd:element>
+        </xsd:choice>
+      </xsd:complexType>
+    </xsd:element>
+  </xsd:schema>
+  <resheader name="resmimetype">
+    <value>text/microsoft-resx</value>
+  </resheader>
+  <resheader name="version">
+    <value>2.0</value>
+  </resheader>
+  <resheader name="reader">
+    <value>System.Resources.ResXResourceReader, System.Windows.Forms, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</value>
+  </resheader>
+  <resheader name="writer">
+    <value>System.Resources.ResXResourceWriter, System.Windows.Forms, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</value>
+  </resheader>
+  <data name="StatusConnected" xml:space="preserve">
+    <value>Connected</value>
+  </data>
+  <data name="StatusConnecting" xml:space="preserve">
+    <value>Connecting...</value>
+  </data>
+  <data name="StatusNotConnected" xml:space="preserve">
+    <value>Not connected</value>
+  </data>
+  <data name="KnobIndex" xml:space="preserve">
+    <value>Knob {0}</value>
+  </data>
+  <data name="DeviceDisplayNameActive" xml:space="preserve">
+    <value>{0}</value>
+  </data>
+  <data name="DeviceDisplayNameDisabled" xml:space="preserve">
+    <value>{0} (Disabled)</value>
+  </data>
+  <data name="DeviceDisplayNameInactive" xml:space="preserve">
+    <value>{0} (Inactive)</value>
+  </data>
+  <data name="DeviceDisplayNameNotPresent" xml:space="preserve">
+    <value>{0} (Not present)</value>
+  </data>
+  <data name="DeviceDisplayNameUnplugged" xml:space="preserve">
+    <value>{0} (Unplugged)</value>
+  </data>
+</root>

Windows/UserControls/KnobDeviceControl.Designer.cs

@@ -0,0 +1,90 @@
+
+namespace MassiveKnob.UserControls
+{
+    partial class KnobDeviceControl
+    {
+        /// <summary> 
+        /// Required designer variable.
+        /// </summary>
+        private System.ComponentModel.IContainer components = null;
+
+        /// <summary> 
+        /// Clean up any resources being used.
+        /// </summary>
+        /// <param name="disposing">true if managed resources should be disposed; otherwise, false.</param>
+        protected override void Dispose(bool disposing)
+        {
+            if (disposing && (components != null))
+            {
+                components.Dispose();
+            }
+            base.Dispose(disposing);
+        }
+
+        #region Component Designer generated code
+
+        /// <summary> 
+        /// Required method for Designer support - do not modify 
+        /// the contents of this method with the code editor.
+        /// </summary>
+        private void InitializeComponent()
+        {
+            this.DeviceCombobox = new System.Windows.Forms.ComboBox();
+            this.KnobIndexLabel = new System.Windows.Forms.Label();
+            this.DeviceLabel = new System.Windows.Forms.Label();
+            this.SuspendLayout();
+            // 
+            // DeviceCombobox
+            // 
+            this.DeviceCombobox.Anchor = ((System.Windows.Forms.AnchorStyles)(((System.Windows.Forms.AnchorStyles.Top | System.Windows.Forms.AnchorStyles.Left) 
+            | System.Windows.Forms.AnchorStyles.Right)));
+            this.DeviceCombobox.DropDownHeight = 300;
+            this.DeviceCombobox.DropDownStyle = System.Windows.Forms.ComboBoxStyle.DropDownList;
+            this.DeviceCombobox.FormattingEnabled = true;
+            this.DeviceCombobox.IntegralHeight = false;
+            this.DeviceCombobox.ItemHeight = 13;
+            this.DeviceCombobox.Location = new System.Drawing.Point(59, 24);
+            this.DeviceCombobox.Name = "DeviceCombobox";
+            this.DeviceCombobox.Size = new System.Drawing.Size(286, 21);
+            this.DeviceCombobox.TabIndex = 0;
+            this.DeviceCombobox.SelectedIndexChanged += new System.EventHandler(this.DeviceCombobox_SelectedIndexChanged);
+            // 
+            // KnobIndexLabel
+            // 
+            this.KnobIndexLabel.Font = new System.Drawing.Font("Microsoft Sans Serif", 8.25F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((byte)(0)));
+            this.KnobIndexLabel.Location = new System.Drawing.Point(3, 8);
+            this.KnobIndexLabel.Name = "KnobIndexLabel";
+            this.KnobIndexLabel.Size = new System.Drawing.Size(342, 13);
+            this.KnobIndexLabel.TabIndex = 1;
+            this.KnobIndexLabel.Text = "Knob X";
+            // 
+            // DeviceLabel
+            // 
+            this.DeviceLabel.AutoSize = true;
+            this.DeviceLabel.Location = new System.Drawing.Point(3, 27);
+            this.DeviceLabel.Name = "DeviceLabel";
+            this.DeviceLabel.Size = new System.Drawing.Size(41, 13);
+            this.DeviceLabel.TabIndex = 2;
+            this.DeviceLabel.Text = "Device";
+            // 
+            // KnobDeviceControl
+            // 
+            this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 13F);
+            this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
+            this.Controls.Add(this.DeviceLabel);
+            this.Controls.Add(this.KnobIndexLabel);
+            this.Controls.Add(this.DeviceCombobox);
+            this.Name = "KnobDeviceControl";
+            this.Size = new System.Drawing.Size(351, 56);
+            this.ResumeLayout(false);
+            this.PerformLayout();
+
+        }
+
+        #endregion
+
+        private System.Windows.Forms.ComboBox DeviceCombobox;
+        private System.Windows.Forms.Label KnobIndexLabel;
+        private System.Windows.Forms.Label DeviceLabel;
+    }
+}

Windows/UserControls/KnobDeviceControl.cs

@@ -0,0 +1,128 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Windows.Forms;
+using MassiveKnob.Hardware;
+
+namespace MassiveKnob.UserControls
+{
+    public partial class KnobDeviceControl : UserControl
+    {
+        private int knobIndex;
+        private Guid? deviceId;
+
+        public event KnobDeviceChangedEventHandler OnDeviceChanged;
+
+
+        public KnobDeviceControl()
+        {
+            InitializeComponent();
+
+            DeviceCombobox.DisplayMember = @"DisplayName";
+        }
+
+
+        public void SetKnobIndex(int index)
+        {
+            knobIndex = index;
+            KnobIndexLabel.Text = string.Format(Strings.KnobIndex, index + 1);
+        }
+
+
+        public void SetDeviceId(Guid? value)
+        {
+            deviceId = value;
+
+            if (DeviceCombobox.Items.Count > 0)
+                DeviceCombobox.SelectedItem = value.HasValue ? new DeviceItem(value.Value) : null;
+        }
+
+        
+        public void SetDevices(IEnumerable<IAudioDevice> devices)
+        {
+            DeviceCombobox.BeginUpdate();
+            try
+            {
+                DeviceCombobox.Items.Clear();
+
+                if (devices == null)
+                    return;
+
+                var sortedDevices = devices.OrderBy(d => d.DisplayName);
+
+                foreach (var device in sortedDevices)
+                {
+                    var itemIndex = DeviceCombobox.Items.Add(
+                        new DeviceItem(device.Id)
+                        {
+                            DisplayName = device.DisplayName
+                        });
+                    
+                    if (deviceId.HasValue && deviceId.Value == device.Id)
+                        DeviceCombobox.SelectedIndex = itemIndex;
+                }
+            }
+            finally
+            {
+                DeviceCombobox.EndUpdate();
+            }
+        }
+
+
+        private void DeviceCombobox_SelectedIndexChanged(object sender, EventArgs e)
+        {
+            OnDeviceChanged?.Invoke(this, new KnobDeviceChangedEventArgs
+            {
+                KnobIndex = knobIndex,
+                DeviceId = ((DeviceItem)DeviceCombobox.SelectedItem)?.DeviceId
+            });
+        }
+        
+
+        private class DeviceItem : IEquatable<DeviceItem>
+        {
+            // ReSharper disable UnusedAutoPropertyAccessor.Local - used by ComboBox
+            public Guid DeviceId { get; }
+            public string DisplayName { get; set; }
+            // ReSharper restore UnusedAutoPropertyAccessor.Local
+
+            
+            public DeviceItem(Guid deviceId)
+            {
+                DeviceId = deviceId;
+            }
+
+            
+            public bool Equals(DeviceItem other)
+            {
+                if (other == null) return false;
+                
+                return ReferenceEquals(this, other) || DeviceId.Equals(other.DeviceId);
+            }
+
+            
+            public override bool Equals(object obj)
+            {
+                if (obj == null) return false;
+                if (ReferenceEquals(this, obj)) return true;
+                
+                return obj is DeviceItem deviceItem && Equals(deviceItem);
+            }
+
+            
+            public override int GetHashCode()
+            {
+                return DeviceId.GetHashCode();
+            }
+        }
+    }
+	
+	
+    public class KnobDeviceChangedEventArgs : EventArgs
+    {
+        public int KnobIndex { get; set; }
+        public Guid? DeviceId { get; set; }
+    }
+    
+    public delegate void KnobDeviceChangedEventHandler(object sender, KnobDeviceChangedEventArgs e);	
+}