>>38
こんな感じでいけるハズ
protected AudioClip se;
se = (AudioClip)Resources.Load("hoge"); // hoge.mp3
if (se.isReadyToPlay){ audio.PlayOneShot(se); }

protected AudioClip bgm;
bgm = (AudioClip)Resources.Load("hoge"); // hoge.mp3
audio.clip = bgm;
audio.loop = true;
if (!audio.isPlaying && audio.clip.isReadyToPlay){ audio.Play(); }