code: private void deliverFaderStartCommand(Set<Integer> playersToStart, Set<Integer> playersToStop) {
          for (final FaderStartListener listener : getFaderStartListeners()) {
              try {
                  listener.fadersChanged(playersToStart, playersToStop);
              } catch (Throwable t) {
                  logger.warn("Problem delivering fader start command to listener", t);
              }
          }
      }
docs: Send a fader start command to all registered listeners.
  
  @param playersToStart contains the device numbers of all players that should start playing
  @param playersToStop contains the device numbers of all players that should stop playing