Intellivision wire up sound system

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

@@ -7,16 +7,16 @@ namespace BizHawk.Emulation.Cores.Intellivision
 	{
 		public IEmulatorServiceProvider ServiceProvider { get; private set; }
 
-		[FeatureNotImplemented]
+		private DCFilter _dcfilter;
+
 		public ISoundProvider SoundProvider
 		{
-			get { return NullSound.SilenceProvider; }
+			get { return _dcfilter; }
 		}
 
-		[FeatureNotImplemented]
 		public ISyncSoundProvider SyncSoundProvider
 		{
-			get { return new FakeSyncSound(NullSound.SilenceProvider, 735); }
+			get { return new FakeSyncSound(_dcfilter, 735); }
 		}
 
 		public bool StartAsyncSound()

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

@@ -63,6 +63,8 @@ namespace BizHawk.Emulation.Cores.Intellivision
 			(ServiceProvider as BasicServiceProvider).Register<ITraceable>(Tracer);
 
 			SetupMemoryDomains();
+
+			_dcfilter = DCFilter.AsISoundProvider(_psg, 256); // not sure how the 256 will change for intellivision I just copied it from Atari for now
 		}
 
 		public IntellivisionControllerDeck ControllerDeck { get; private set; }

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

@@ -1,13 +1,25 @@
 using BizHawk.Common.NumberExtensions;
 using System;
 using BizHawk.Common;
+using BizHawk.Emulation.Common;
 
 namespace BizHawk.Emulation.Cores.Intellivision
 {
-	public sealed class PSG
+	public sealed class PSG : ISoundProvider
 	{
 		public ushort[] Register = new ushort[16];
 
+		public int MaxVolume { get; set; }
+
+		public void DiscardSamples()
+		{
+			
+		}
+
+		public void GetSamples(short[] samples)
+		{
+		}
+
 		public int TotalExecutedCycles;
 		public int PendingCycles;