2014年くらいにUnityオーディオでビートに合わせてイベントを飛ばすようなもののSoundManager http://www.nicovideo.jp/watch/sm24159030　(GAMEOVERというタイトル）

SoundManager.cs

using UnityEngine;
using System.Collections;
using System.Collections.Generic;

public class SoundManager : MonoBehaviour {

	public static SoundManager main = null;

	AudioSource audioSourceBGM;
	public List<AudioClip> bgmClipList = new List<AudioClip>();

	public enum TrgType {
		CLOSE,
		SWITCH_ENEMY,
		OPEN,
	}

	public class BPM_Time_Struct
	{
		public BPM_Time_Struct(TrgType type, float t,float b,string n)
		{
			trgtype = type;
			changeTime = t;
			bpm = b;
			name=n;
		}

		public TrgType trgtype = TrgType.CLOSE;
		public float changeTime = 0;
		public float bpm = 105;
		public string name = "";
	}

	void Awake()
	{
		if(main != null)
		{
			GameObject.Destroy(this);
		} else
		{
			main = this;
		}
	}

	public List<BPM_Time_Struct> bpmList = new List<BPM_Time_Struct>();

	ParticleSystem ps;

	[SerializeField]
	private int _RenderQueue = 4000;
	
	void RenderStart ()
	{
		renderer.material.renderQueue = _RenderQueue;
		
		Transform trans = transform;
		for (int i = 0; i < trans.childCount; i++) {
			trans.GetChild (i).gameObject.renderer.material.renderQueue = _RenderQueue;
		}

		ps = this.gameObject.GetComponent<ParticleSystem>();
	}

	// Use this for initialization
	void Start () {
		RenderStart();

		bpmList.Add(new BPM_Time_Struct( TrgType.SWITCH_ENEMY,  0,105,"A"));			
		bpmList.Add(new BPM_Time_Struct( TrgType.OPEN, 			(9.03f/8)*1,105,"A"));
		bpmList.Add(new BPM_Time_Struct( TrgType.CLOSE,			(9.03f/8)*2,105,"A"));
		bpmList.Add(new BPM_Time_Struct( TrgType.OPEN, 			(9.03f/8)*3,105,"A"));
		bpmList.Add(new BPM_Time_Struct( TrgType.OPEN, 			(9.03f/8)*4,105,"A"));
		bpmList.Add(new BPM_Time_Struct( TrgType.CLOSE,			(9.03f/8)*5,105,"A"));
		bpmList.Add(new BPM_Time_Struct( TrgType.SWITCH_ENEMY, 	(9.03f/8)*6,105,"A"));
		bpmList.Add(new BPM_Time_Struct( TrgType.OPEN, 			9.03f + ((17.66f-9.03f)/8)*0,118,"B"));
		bpmList.Add(new BPM_Time_Struct( TrgType.CLOSE, 		9.03f + ((17.66f-9.03f)/8)*1,118,"B"));
		bpmList.Add(new BPM_Time_Struct( TrgType.OPEN,			9.03f + ((17.66f-9.03f)/8)*2,118,"B"));
		bpmList.Add(new BPM_Time_Struct( TrgType.OPEN, 			9.03f + ((17.66f-9.03f)/8)*3,118,"B"));
		bpmList.Add(new BPM_Time_Struct( TrgType.CLOSE, 		9.03f + ((17.66f-9.03f)/8)*4,118,"B"));
		bpmList.Add(new BPM_Time_Struct( TrgType.OPEN, 			9.03f + ((17.66f-9.03f)/8)*5,118,"B"));
		bpmList.Add(new BPM_Time_Struct( TrgType.OPEN,			9.03f + ((17.66f-9.03f)/8)*6,118,"B"));
		bpmList.Add(new BPM_Time_Struct( TrgType.CLOSE, 		9.03f + ((17.66f-9.03f)/8)*7,118,"B"));
		bpmList.Add(new BPM_Time_Struct( TrgType.SWITCH_ENEMY,	17.66f + ((29.22f-17.66f)/8)*0,152,"C"));
		bpmList.Add(new BPM_Time_Struct( TrgType.OPEN, 			17.66f + ((29.22f-17.66f)/8)*1,152,"C"));
		bpmList.Add(new BPM_Time_Struct( TrgType.CLOSE, 		17.66f + ((29.22f-17.66f)/8)*2,152,"C"));
		bpmList.Add(new BPM_Time_Struct( TrgType.SWITCH_ENEMY,	17.66f + ((29.22f-17.66f)/8)*3,152,"C"));
		bpmList.Add(new BPM_Time_Struct( TrgType.OPEN,			17.66f + ((29.22f-17.66f)/8)*4,152,"C"));
		bpmList.Add(new BPM_Time_Struct( TrgType.CLOSE, 		17.66f + ((29.22f-17.66f)/8)*5,152,"C"));
		bpmList.Add(new BPM_Time_Struct( TrgType.SWITCH_ENEMY, 	17.66f + ((29.22f-17.66f)/8)*6,152,"C"));
		bpmList.Add(new BPM_Time_Struct( TrgType.OPEN,			17.66f + ((29.22f-17.66f)/8)*7,152,"C"));
		bpmList.Add(new BPM_Time_Struct( TrgType.OPEN, 			29.22f+2f,152,"EndPre"));
		bpmList.Add(new BPM_Time_Struct( TrgType.CLOSE, 		29.22f+4f,152,"End"));

		EventPartChange += PartChangeTest;
		
		audioSourceBGM = this.gameObject.AddComponent<AudioSource>();

		if(Application.loadedLevelName == "game"){
			audioSourceBGM.clip = bgmClipList[Random.Range(0,7)%(bgmClipList.Count-1)];
			audioSourceBGM.Play();
		}
	}


	void PartChangeTest(BPM_Time_Struct arg)
	{
		Debug.Log(arg.trgtype.ToString());
	}



//	int lastBeatNo = 0;
//	int beatNo = 0;

	BPM_Time_Struct GetBPM_Time_Struct(float time)
	{
		if(time == 0)
		{
			return bpmList[0];
		}

		for(int btsIndex = 0;btsIndex < bpmList.Count - 1;btsIndex++)
		{
			if(bpmList[btsIndex].changeTime < time && time < bpmList[btsIndex+1].changeTime)
			{
				return bpmList[btsIndex];
			}
		}

		return bpmList[bpmList.Count-1];
	}


	BPM_Time_Struct lastBPM_Time_Struct;
	public BPM_Time_Struct currentBPM_Time_Struct;

	// Update is called once per frame
	void Update () {
		if(audioSourceBGM.isPlaying)
		{
			currentBPM_Time_Struct = GetBPM_Time_Struct(audioSourceBGM.time);

			if(currentBPM_Time_Struct != lastBPM_Time_Struct)
			{
				EventPartChange(currentBPM_Time_Struct);
				lastBPM_Time_Struct = currentBPM_Time_Struct;
			}
		}
	}

	//---------------イベント-------------------------------------------------------------------------
	public delegate void PartChange (BPM_Time_Struct arg);		//	ビートイベントコールバック登録用デリゲート
	static public PartChange EventPartChange;	//	ビートイベントコールバック登録用

	//----------------------------------------------------------------------------------


	public List<AudioClip> continueClipList = new List<AudioClip>();
	public void PlayneCount(int neCount)
	{
		if(neCount%20 == 0){
			//Debug.Log("neCount " + neCount);
			audio.PlayOneShot(continueClipList[(neCount/20)%(continueClipList.Count-1)],0.41f);
		}
	}

	
	public List<AudioClip> hajikuClipList = new List<AudioClip>();

	int HajikuCount = 0;
	public void PlayHajiku()
	{

		HajikuCount++;
		if(HajikuCount%4 == 0){
			audio.PlayOneShot(hajikuClipList[0],0.7f);

			ps.enableEmission = true;
			ps.maxParticles = 100;
		}
	}

	public void PlayShut()
	{
		ps.maxParticles = 0;
		ps.enableEmission = false;
		{
			audio.PlayOneShot(hajikuClipList[1],0.7f);
        }
    }

	public void PlayClose()
	{
		ps.maxParticles = 0;
		ps.enableEmission = false;
		{
			audio.PlayOneShot(hajikuClipList[2],0.7f);
        }
    }

	int GrowlCount = 0;
	public void PlayGrowl()
	{
		GrowlCount += Random.Range(1,3);
		ps.maxParticles = 0;
		ps.enableEmission = false;
		if(GrowlCount%8 == 0)
		{
			audio.PlayOneShot(hajikuClipList[3],0.7f);
        }
    }
    
    public List<AudioClip> titleClipList = new List<AudioClip>();
	public void PlayTitle()
	{
		//audio.PlayOneShot(titleClipList[0],0.7f);

		audioSourceBGM.clip = titleClipList[0];
		audioSourceBGM.loop = true;
		audioSourceBGM.Play();
	}

}