Unity3d Metronome

using UnityEngine;
using System;
using System.Collections;

public class Metronome : MonoBehaviour
{
    public struct Timing
    {
        public float beats;
        public int measures;
        public float totalBeats;
    }

    public class Settings
    {
        float bpm;
        public float BPM
        {
            get{ return bpm; }
            set
            {
                if( value <= 0 ) return;
                bpm = value;
                beatTime = 60f/bpm;
            }
        }

        float beatTime;

        int beatsPerMeasure;

        public Settings( float bpm = 120f, int beatsPerMeasure = 4 )
        {
            this.BPM = bpm;
            this.beatsPerMeasure = beatsPerMeasure;
        }

        public Timing GetTimingData( float realTime )
        {
            Timing t = new Timing();
            t.totalBeats = realTime / beatTime;
            t.measures = (int)(t.totalBeats/beatsPerMeasure);
            t.beats = t.totalBeats % beatsPerMeasure + 1;
            return t;
        }

        public string PrettyString()
        {
            return string.Format( "{0}bpm ({1}/4)", bpm, beatsPerMeasure );
        }
    }

    static float debugYPos =  10f;
    float myDebugYPos;

    Settings settings;
    Timing currentTiming;
    bool playing = false;
    float timeSinceStart;

    public static Metronome Create( Settings settings, bool playImmediately = true )
    {
        GameObject go = new GameObject( "Metro: " + settings.PrettyString(), typeof(Metronome) );
        Metronome metro = go.GetComponent<Metronome>();
        metro.settings = settings;

        if( playImmediately ) metro.Play();

        metro.myDebugYPos = debugYPos;
        debugYPos += 20f;

        return metro;
    }

    public void Play( bool reset = true )
    {
        if( reset ) timeSinceStart = 0f;
        playing = true;
    }
    public void Stop(){playing = false;}

    void Update()
    {
        if( playing )
        {
            currentTiming = settings.GetTimingData( timeSinceStart );
            timeSinceStart += Time.deltaTime;
        }
    }

    void OnGUI()
    {
        GUI.Label( new Rect(10,myDebugYPos,500,30),
            string.Format( "{0}: {1}:{2:f2} (total beats: {3:f3})",
            name, currentTiming.measures, currentTiming.beats, currentTiming.totalBeats ) );
    }
}