スクリプトだけで全部やったなあ…
[SerializeField] AudioClip[] SeMp3;

public enum SType
{
SE1 = 0,
SE2,

ENDCOUNT
}


private AudioSource[] m_AudioSource= new AudioSource[(int)SType.ENDCOUNT];

void Start()
{
for (var i = 0; i < m_AudioSource.Length; ++i)
{
m_AudioSource[i] = gameObject.AddComponent<AudioSource>();
m_AudioSource[i].clip = SeMp3[i];
}
}

public void Play(SType sOUND_TYPE)
{
m_AudioSource[(int)sOUND_TYPE].Stop();
m_AudioSource[(int)sOUND_TYPE].Play();
}