- initialize faders with initial volumes

Lib.Audio/Channel.cs

@@ -58,9 +58,10 @@ namespace Lib.Audio
         {
             Controllable = controllable;
             ToggleSelectButtonLed();
+            InitializeFader(controllable);
         }
 
-        public void UnMapControllable()
+        private void UnMapControllable()
         {
             if (Controllable == null)
                 return;
@@ -109,6 +110,17 @@ namespace Lib.Audio
             _acknowledgeMessage = null;
         }
 
+        private void InitializeFader(IControllable controllable)
+        {
+            if (Fader == null)
+                return;
+            
+            float volume = controllable.GetVolume();
+            Fader.RelativePosition = volume;
+            
+            _midiCommunication.Send(new PitchWheelChangeMessage(0, _channelNumber, Fader.Position));
+        }
+        
         private void ToggleSelectButtonLed()
         {
             ISelectButton? selectButton = Buttons?.OfType<ISelectButton>().FirstOrDefault();
@@ -127,5 +139,11 @@ namespace Lib.Audio
         }
 
         public override string ToString() => $"Channel {_channelNumber}";
+
+        public void Dispose()
+        {
+            UnMapControllable();
+            _midiCommunication.Send(new PitchWheelChangeMessage(0, _channelNumber, 0));
+        }
     }
 }

Lib.Audio/Controllable.cs

@@ -23,6 +23,8 @@ namespace Lib.Audio
         public string? IconPath => _audioSessionControls.FirstOrDefault(c => !string.IsNullOrEmpty(c.IconPath))?.IconPath;
 
         public void SetVolume(float volume) => _audioSessionControls.ForEach(c => c.SimpleAudioVolume.Volume = volume);
+        public float GetVolume() => _audioSessionControls[0].SimpleAudioVolume.Volume; //TODO: Can we always take 0?
+
         public void Mute() => _audioSessionControls.ForEach(c => c.SimpleAudioVolume.Mute = true);
         public void UnMute() => _audioSessionControls.ForEach(c => c.SimpleAudioVolume.Mute = false);
 

Lib.Audio/Controls/Fader.cs

@@ -29,7 +29,11 @@ namespace Lib.Audio.Controls
         }
 
         public bool IsTouched { get; set; }
-        public float RelativePosition => Position / (MAX_POSITION - MIN_POSITION);
+        public float RelativePosition
+        {
+            get => Position / (MAX_POSITION - MIN_POSITION);
+            set => _position = (int) (value * (MAX_POSITION - MIN_POSITION));
+        }
 
         public event EventHandler<int>? PositionChanged;
     }

Lib.Audio/Controls/Interfaces/IFader.cs

@@ -13,7 +13,7 @@ namespace Lib.Audio.Controls.Interfaces
         
         bool IsTouched { get; set; }
         
-        float RelativePosition { get; }
+        float RelativePosition { get; set; }
 
         event EventHandler<int>? PositionChanged;
     }

Lib.Audio/Device.cs

@@ -50,7 +50,7 @@ namespace Lib.Audio
 
         public void Dispose()
         {
-            Channels.ForEach(c => c.UnMapControllable());
+            Channels.ForEach(c => c.Dispose());
             _midiCommunication.Close();
         }
     }

Lib.Audio/Interfaces/IChannel.cs

@@ -2,6 +2,7 @@
 // Created: 2021-04-07
 // Copyright(c) 2021 SimonG. All Rights Reserved.
 
+using System;
 using System.Collections.Generic;
 using Lib.Audio.Controls.Buttons.Interfaces;
 using Lib.Audio.Controls.Interfaces;
@@ -9,7 +10,7 @@ using Lib.Midi.Messages.Interfaces;
 
 namespace Lib.Audio.Interfaces
 {
-    public interface IChannel
+    public interface IChannel : IDisposable
     {
         IFader? Fader { get; }
         IKnob? Knob { get; }
@@ -18,7 +19,6 @@ namespace Lib.Audio.Interfaces
         IControllable? Controllable { get; }
 
         void MapControllable(IControllable controllable);
-        void UnMapControllable();
         void HandleMessage(IMidiMessage message);
         void SendAcknowledge();
     }

Lib.Audio/Interfaces/IControllable.cs

@@ -10,6 +10,7 @@ namespace Lib.Audio.Interfaces
         string? IconPath { get; }
         
         void SetVolume(float volume);
+        float GetVolume();
         void Mute();
         void UnMute();
     }

Lib.Audio/MasterControllable.cs

@@ -43,6 +43,11 @@ namespace Lib.Audio
             // }
         }
 
+        public float GetVolume()
+        {
+            throw new System.NotImplementedException();
+        }
+
         public void Mute() => _audioEndpointVolume.Mute = true;
         public void UnMute() => _audioEndpointVolume.Mute = false;