- correctly convert position to volume

Lib.Audio/Channel.cs

@@ -82,7 +82,13 @@ namespace Lib.Audio
             _acknowledgeMessage = null;
         }
 
-        private void OnFaderPositionChanged(object? sender, float position) => Controllable?.SetVolume(position);
+        private void OnFaderPositionChanged(object? sender, int position)
+        {
+            if (sender is not IFader fader)
+                return;
+            
+            Controllable?.SetVolume(fader.RelativePosition);
+        }
 
         public override string ToString() => $"Channel {_channelNumber}";
     }

Lib.Audio/Controls/Fader.cs

@@ -10,12 +10,14 @@ namespace Lib.Audio.Controls
 {
     public class Fader : IFader
     {
+        private const float MIN_POSITION = 0; //TODO: calibrate? get from driver?
+        private const float MAX_POSITION = 16256; //TODO: calibrate? get from driver?
+            
         private int _position;
 
         public Fader(XmlFader xmlFader) => NoteNumber = xmlFader.NoteNumber;
 
         public int NoteNumber { get; }
-
         public int Position
         {
             get => _position;
@@ -27,7 +29,8 @@ namespace Lib.Audio.Controls
         }
 
         public bool IsTouched { get; set; }
+        public float RelativePosition => Position / (MAX_POSITION - MIN_POSITION);
 
-        public event EventHandler<float>? PositionChanged;
+        public event EventHandler<int>? PositionChanged;
     }
 }

Lib.Audio/Controls/Interfaces/IFader.cs

@@ -12,7 +12,9 @@ namespace Lib.Audio.Controls.Interfaces
         int Position { get; set; }
         
         bool IsTouched { get; set; }
+        
+        float RelativePosition { get; }
 
-        event EventHandler<float>? PositionChanged;
+        event EventHandler<int>? PositionChanged;
     }
 }