code: protected byte[] getClipData (SoundKey key)
          throws IOException, UnsupportedAudioFileException
      {
          byte[][] data;
          synchronized (_clipCache) {
              // if we're testing, clear all non-locked sounds every time
              if (isTesting()) {
                  _clipCache.clear();
              }
  
              data = _clipCache.get(key);
  
              // see if it's in the locked cache (we first look in the regular
              // clip cache so that locked clips that are still cached continue
              // to be moved to the head of the LRU queue)
              if (data == null) {
                  data = _lockedClips.get(key);
              }
  
              if (data == null) {
                  // if there is a test sound, JUST use the test sound.
                  InputStream stream = getTestClip(key);
                  if (stream != null) {
                      data = new byte[1][];
                      data[0] = StreamUtil.toByteArray(stream);
  
                  } else {
                      data = _loader.load(key.pkgPath, key.key);
                  }
  
                  _clipCache.put(key, data);
              }
          }
  
          return (data.length > 0) ? data[RandomUtil.getInt(data.length)] : null;
      }
docs: Called by spooling threads, loads clip data from the resource manager or the cache.