BeatCounter, a Unity script used to determine timing.

BeatCounter.cs

using UnityEngine;
using System.Collections;
using System;

[RequireComponent(typeof(AudioSource))]
public class BeatCounter : MonoBehaviour {
	public Action<int> BeatEvent = delegate { };
	public Action BarEvent = delegate { };
	public float bpm;
	public int beatsPerBar;
    	public int beatOffset = 1;
	public bool isAudioPlaying;
	private float samplesPerBeat;

	private int currentBeat = 0;

	private float beatSphereSize = 0;
	private float barSphereSize = 0;

	// Use this for initialization
	void OnBeat (int beatCount) {
		beatSphereSize = 2;
        	BeatEvent(beatCount % beatsPerBar);
		//Debug.Log(currentBeat);
		if(beatsPerBar > 0 && (currentBeat == 0 || ((currentBeat) % beatsPerBar == 0))){
			OnBar();
		}
	}

	void OnBar () {
		//Debug.Log("bar");
		BarEvent();
		barSphereSize = 2;

	}

	public void Reset(){
		currentBeat = 0;
		isAudioPlaying = false;
	}

	public void StartCount(){
		float samplesPerMin = GetComponent<AudioSource>().clip.samples * (60f/GetComponent<AudioSource>().clip.length);
		samplesPerBeat = samplesPerMin / bpm;
		currentBeat = Mathf.FloorToInt(GetComponent<AudioSource>().timeSamples / samplesPerBeat);
		isAudioPlaying = true;
        	currentBeat = beatOffset;
	}
	
	// Update is called once per frame
	void Update () {
		if(!isAudioPlaying && GetComponent<AudioSource>().isPlaying){
			StartCount();
		}
		else{
        		int newBeat = Mathf.FloorToInt(GetComponent<AudioSource>().timeSamples / samplesPerBeat) + beatOffset;
			if(newBeat > currentBeat){
				currentBeat = newBeat;
                		OnBeat(currentBeat);
			}
			else if(newBeat < currentBeat){
				Debug.Log("Loop!");
				currentBeat = newBeat;
                		OnBeat(currentBeat);
			}
		}
		barSphereSize-= 5 * Time.deltaTime;
		if(barSphereSize < 0){
			barSphereSize = 0;
		}

		beatSphereSize-= 5 * Time.deltaTime;
		if(beatSphereSize < 0){
			beatSphereSize = 0;
		}
	}

	void OnDrawGizmos() {
		Gizmos.color = Color.red;
		Gizmos.DrawSphere(transform.position, beatSphereSize);

		Vector3 pos = transform.position;
		pos.x += 4;
		Gizmos.color = Color.blue;
		Gizmos.DrawSphere(transform.position, barSphereSize);
	}
}