Remove a now unused MaxVolume property from some sound provider classes

BizHawk.Emulation.Common/Base Implementations/NullSound.cs

@@ -6,6 +6,5 @@
 
 		public void GetSamples(short[] samples) { }
 		public void DiscardSamples() { }
-		public int MaxVolume { get; set; }
 	}
 }

BizHawk.Emulation.Common/Sound/Utilities/BufferedAsync.cs

@@ -54,8 +54,6 @@ namespace BizHawk.Emulation.Common
 				BaseSoundProvider.DiscardSamples();
 		}
 
-		public int MaxVolume { get; set; }
-
 		public void GetSamples(short[] samples)
 		{
 			int samplesToGenerate = SamplesInOneFrame;

BizHawk.Emulation.Common/Sound/Utilities/Metaspu.cs

@@ -30,8 +30,6 @@ namespace BizHawk.Emulation.Common
 			input.DiscardSamples();
 			buffer.clear();
 		}
-
-		public int MaxVolume { get; set; }
 	}
 
 	public class MetaspuSoundProvider : ISoundProvider
@@ -64,8 +62,6 @@ namespace BizHawk.Emulation.Common
 		{
 			buffer.clear();
 		}
-
-		public int MaxVolume { get; set; }
 	}
 
 	public interface ISynchronizingAudioBuffer

BizHawk.Emulation.Cores/Consoles/Atari/2600/Tia/TIA.cs

@@ -371,8 +371,6 @@ namespace BizHawk.Emulation.Cores.Atari.Atari2600
         /// </summary>
         public Action<int> FrameEndCallBack { get; set; }
 
-        public int MaxVolume { get; set; }
-
         public int VirtualWidth
         {
             // TODO: PAL?

BizHawk.Emulation.Cores/Consoles/Intellivision/PSG.cs

@@ -9,8 +9,6 @@ namespace BizHawk.Emulation.Cores.Intellivision
 	{
 		public ushort[] Register = new ushort[16];
 
-		public int MaxVolume { get; set; }
-
 		public void DiscardSamples()
 		{
 			

BizHawk.Emulation.Cores/Consoles/Nintendo/NES/NES.Core.cs

@@ -148,8 +148,6 @@ namespace BizHawk.Emulation.Cores.Nintendo.NES
 				nes.apu.sampleclock = 0;
 			}
 
-			public int MaxVolume { get; set; }
-
 			public void Dispose()
 			{
 				if (blip != null)