PooledAudioSource.cs

using UnityEngine;
using System;
using System.Collections;
using System.Collections.Generic;
using System.Linq;
using LiberiNet;

public delegate void PooledSoundFinishedHandler (PooledAudioSource source);

public class PooledAudioSource : MonoBehaviour
{
    public event PooledSoundFinishedHandler SoundFinished;

    [HideInInspector]
    public Transform Target;

    public void Play (AudioClip clip, float volume, float pitch)
    {
        audio.clip = clip;
        audio.volume = volume;
        audio.pitch = pitch;

        StartCoroutine(PlayAsync());
    }

    private IEnumerator PlayAsync ()
    {
        audio.Play();

        while (audio.isPlaying)
        {
            yield return null;
        }

        if (SoundFinished != null)
            SoundFinished(this);

        Target = null;
    }

    void LateUpdate ()
    {
        if (Target != null)
            transform.position = Target.position;
    }
}