Created a Method to play Sounds directly from .wav files instead of using the buggy Minecraft Sound System and uses it in SoundHandler#playRenderSuccessSound(), fixing https://trello.com/c/d8hDHkc5/

src/main/java/eu/crushedpixel/replaymod/sound/SoundHandler.java

@@ -1,15 +1,36 @@
 package eu.crushedpixel.replaymod.sound;
 
 import net.minecraft.client.Minecraft;
-import net.minecraft.client.audio.PositionedSoundRecord;
 import net.minecraft.util.ResourceLocation;
 
+import javax.sound.sampled.AudioInputStream;
+import javax.sound.sampled.AudioSystem;
+import javax.sound.sampled.Clip;
+import java.io.InputStream;
+
 public class SoundHandler {
 
     private final Minecraft mc = Minecraft.getMinecraft();
-    private final ResourceLocation successSoundLocation = new ResourceLocation("replaymod:renderSuccess");
+    private final ResourceLocation successSoundLocation = new ResourceLocation("replaymod", "renderSuccess.wav");
 
     public void playRenderSuccessSound() {
-        mc.getSoundHandler().playSound(PositionedSoundRecord.create(successSoundLocation, 1.0F));
+        playSound(successSoundLocation);
+    }
+
+    /**
+     * Plays a <b>.wav</b> Sound from a ResourceLocation. This method does <b>not</b> respect Game Settings like Audio Volume.
+     * @param loc The Sound File's ResourceLocation
+     */
+    public void playSound(ResourceLocation loc) {
+        try {
+            InputStream is = Minecraft.getMinecraft().getResourceManager().getResource(loc).getInputStream();
+            AudioInputStream ais = AudioSystem.getAudioInputStream(is);
+
+            Clip clip = AudioSystem.getClip();
+            clip.open(ais);
+            clip.start();
+        } catch(Exception e) {
+            e.printStackTrace();
+        }
     }
 }

src/main/resources/assets/replaymod/sounds.json

@@ -1,3 +0,0 @@
-{
-	"renderSuccess":{"category": "master", "sounds":["renderSuccess"]}
-}