Fix audioClip converting

AssetStudio/Math/Clamp.cs

@@ -0,0 +1,18 @@
+using System;
+using System.Runtime.CompilerServices;
+
+namespace AssetStudio
+{
+    public static partial class MathHelper
+    {
+        [MethodImpl(MethodImplOptions.AggressiveInlining)]
+        public static float Clamp(float value, float minValue, float maxValue)
+        {
+#if NETFRAMEWORK
+            return Math.Max(minValue, Math.Min(value, maxValue));
+#else
+            return Math.Clamp(value, minValue, maxValue);
+#endif
+        }
+    }
+}