diff --git a/src/Audio/SoundInstance.cs b/src/Audio/SoundInstance.cs
index d219a04..10e3650 100644
--- a/src/Audio/SoundInstance.cs
+++ b/src/Audio/SoundInstance.cs
@@ -7,7 +7,9 @@ namespace MoonWorks.Audio
 	public abstract class SoundInstance : AudioResource
 	{
 		internal IntPtr Voice;
-		internal FAudio.FAudioWaveFormatEx Format;
+
+		private FAudio.FAudioWaveFormatEx format;
+		public FAudio.FAudioWaveFormatEx Format => format;
 
 		protected FAudio.F3DAUDIO_DSP_SETTINGS dspSettings;
 
@@ -24,6 +26,7 @@ namespace MoonWorks.Audio
 			get => pan;
 			internal set
 			{
+				value = Math.MathHelper.Clamp(value, -1f, 1f);
 				if (pan != value)
 				{
 					pan = value;
@@ -58,9 +61,10 @@ namespace MoonWorks.Audio
 			get => pitch;
 			internal set
 			{
+				value = Math.MathHelper.Clamp(value, -1f, 1f);
 				if (pitch != value)
 				{
-					pitch = Math.MathHelper.Clamp(value, -1f, 1f);
+					pitch = value;
 					UpdatePitch();
 				}
 			}
@@ -72,6 +76,7 @@ namespace MoonWorks.Audio
 			get => volume;
 			internal set
 			{
+				value = Math.MathHelper.Max(0, value);
 				if (volume != value)
 				{
 					volume = value;
@@ -95,9 +100,9 @@ namespace MoonWorks.Audio
 			get => filterParameters.Frequency;
 			internal set
 			{
+				value = System.Math.Clamp(value, 0.01f, MAX_FILTER_FREQUENCY);
 				if (filterParameters.Frequency != value)
 				{
-					value = System.Math.Clamp(value, 0.01f, MAX_FILTER_FREQUENCY);
 					filterParameters.Frequency = value;
 
 					FAudio.FAudioVoice_SetFilterParameters(
@@ -114,9 +119,9 @@ namespace MoonWorks.Audio
 			get => filterParameters.OneOverQ;
 			internal set
 			{
+				value = System.Math.Clamp(value, 0.01f, MAX_FILTER_ONEOVERQ);
 				if (filterParameters.OneOverQ != value)
 				{
-					value = System.Math.Clamp(value, 0.01f, MAX_FILTER_ONEOVERQ);
 					filterParameters.OneOverQ = value;
 
 					FAudio.FAudioVoice_SetFilterParameters(
@@ -181,6 +186,7 @@ namespace MoonWorks.Audio
 			{
 				if (ReverbEffect != null)
 				{
+					value = MathF.Max(0, value);
 					if (reverb != value)
 					{
 						reverb = value;
@@ -221,7 +227,7 @@ namespace MoonWorks.Audio
 			uint samplesPerSecond
 		) : base(device)
 		{
-			var format = new FAudio.FAudioWaveFormatEx
+			format = new FAudio.FAudioWaveFormatEx
 			{
 				wFormatTag = formatTag,
 				wBitsPerSample = bitsPerSample,
@@ -231,12 +237,10 @@ namespace MoonWorks.Audio
 				nAvgBytesPerSec = blockAlign * samplesPerSecond
 			};
 
-			Format = format;
-
 			FAudio.FAudio_CreateSourceVoice(
 				Device.Handle,
 				out Voice,
-				ref Format,
+				ref format,
 				FAudio.FAUDIO_VOICE_USEFILTER,
 				FAudio.FAUDIO_DEFAULT_FREQ_RATIO,
 				IntPtr.Zero,