avoid calling into FAudio if property did not change

src/Audio/SoundInstance.cs

@@ -23,6 +23,8 @@ namespace MoonWorks.Audio
 		{
 			get => pan;
 			internal set
+			{
+				if (pan != value)
 				{
 					pan = value;
 
@@ -48,28 +50,35 @@ namespace MoonWorks.Audio
 					);
 				}
 			}
+		}
 
 		private float pitch = 0;
 		public float Pitch
 		{
 			get => pitch;
 			internal set
+			{
+				if (pitch != value)
 				{
 					pitch = Math.MathHelper.Clamp(value, -1f, 1f);
 					UpdatePitch();
 				}
 			}
+		}
 
 		private float volume = 1;
 		public float Volume
 		{
 			get => volume;
 			internal set
+			{
+				if (volume != value)
 				{
 					volume = value;
 					FAudio.FAudioVoice_SetVolume(Voice, volume, 0);
 				}
 			}
+		}
 
 		private const float MAX_FILTER_FREQUENCY = 1f;
 		private const float MAX_FILTER_ONEOVERQ = 1.5f;
@@ -85,6 +94,8 @@ namespace MoonWorks.Audio
 		{
 			get => filterParameters.Frequency;
 			internal set
+			{
+				if (filterParameters.Frequency != value)
 				{
 					value = System.Math.Clamp(value, 0.01f, MAX_FILTER_FREQUENCY);
 					filterParameters.Frequency = value;
@@ -96,6 +107,7 @@ namespace MoonWorks.Audio
 					);
 				}
 			}
+		}
 
 		private float FilterOneOverQ
 		{
@@ -118,6 +130,8 @@ namespace MoonWorks.Audio
 		{
 			get => filterType;
 			set
+			{
+				if (filterType != value)
 				{
 					filterType = value;
 
@@ -152,6 +166,7 @@ namespace MoonWorks.Audio
 					);
 				}
 			}
+		}
 
 		private float reverb;
 		public unsafe float Reverb
@@ -160,6 +175,8 @@ namespace MoonWorks.Audio
 			internal set
 			{
 				if (ReverbEffect != null)
+				{
+					if (reverb != value)
 					{
 						reverb = value;
 
@@ -179,6 +196,7 @@ namespace MoonWorks.Audio
 							0
 						);
 					}
+				}
 
 				#if DEBUG
 				if (ReverbEffect == null)