Add pitch variations (#874)

Content.Shared/Audio/AudioHelpers.cs

@@ -0,0 +1,22 @@
+using System;
+using Content.Shared.GameObjects.Components.Sound;
+using Robust.Shared.Audio;
+using Robust.Shared.GameObjects;
+using Robust.Shared.Interfaces.Random;
+using Robust.Shared.IoC;
+using Robust.Shared.Log;
+using Robust.Shared.Random;
+
+namespace Content.Shared.Audio
+{
+    public static class AudioHelpers{
+        /// <summary>
+        ///     Returns a random pitch.
+        /// </summary>
+        public static AudioParams WithVariation(float amplitude)
+        {
+            var scale = (float)(IoCManager.Resolve<IRobustRandom>().NextGaussian(1, amplitude));
+            return AudioParams.Default.WithPitchScale(scale);
+        }
+    }
+}