AudioClip getAudioClip(string filePath){
string ext = Path.GetExtension(filePath);
if(ext!=null && ext.Length>0)
filePath = filePath.Replace (ext, "");
AudioClip audio;
if(_preLoadedAudios!=null && _preLoadedAudios.TryGetValue(filePath, out audio)){
return audio;
}
audio = Resources.Load<AudioClip> (filePath);
return audio;
}