public int playEffect(string filePath){
if (filePath == null) {
CCDebug.Warning ("cocos2d:SimpleAudioEngine: Audio file path should not be null.");
return - 1;
}
AudioClip audio = getAudioClip (filePath);
if(audio==null){
CCDebug.Warning ("cocos2d:SimpleAudioEngine: Audio {0} not found.", filePath);
return -1;
}else{
_currentSource = (_currentSource+1)%AUDIO_SOURCES_NUM;
playAudio (audio, _audioSources[_currentSource], false, _effectsVolume);
return _currentSource;
}
}