Merge pull request zmxv#363 from escobar5/master

Fix for zmxv#362

sound.js

@@ -58,8 +58,8 @@ function Sound(filename, basePath, onError, options) {
   }
 
   this._loaded = false;
+  this._key = asset ? filename : djb2Code(filename); //if the file is an asset, use the asset number as the key
   this._playing = false;
-  this._key = djb2Code(filename);
   this._duration = -1;
   this._numberOfChannels = -1;
   this._volume = 1;