This will pulsate the float properties of any object added to that so that they are all in time with a specific bpm.

WTPulsator.cs

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

public class WTPulsator {
  public List<WTPulsatorObject> objects = new List<WTPulsatorObject>();
	public float totalTime = 0;
	public float bpm;
	bool isPulsating = false;

	public WTPulsator(float bpm) {
		this.bpm = bpm;
		StartPulsating();
	}

	public void StartPulsating() {
		isPulsating = true;
	}

	public void StopPulsating() {
		isPulsating = false;
	}

	public WTPulsator AddPulsateProperty(object targetObject, string propertyName, float valA, float valB, float numBeats = 1) {
		WTPulsatorObject po = new WTPulsatorObject(targetObject, propertyName, valA, valB, numBeats);
		objects.Add(po);

		float allTime = totalTime;

		int amt = 0;
		while (allTime > 30.0f / bpm * po.numBeats) {
			amt++;
			allTime -= 30.0f / bpm * po.numBeats;
		}

		if (amt % 2 == 0) po.isPulsatingUp = true;
		else po.isPulsatingUp = false;

		po.halfTimer = allTime;
		po.Refresh(bpm);

		return this;
	}

	public void RemoveTargetObject(object targetObject) {
		for (int i = objects.Count - 1; i >= 0; i--) {
			WTPulsatorObject po = objects[i];
			if (po.targetObject == targetObject) {
				objects.Remove(po);
			}
		}
	}

	public void RemoveAllTargetObjects() {
		for (int i = objects.Count - 1; i >= 0; i--) {
			objects.RemoveAt(objects.Count -1 );
		}
	}

	public void AdjustVals(object targetObject, string propertyName, float valA, float valB) {
		for (int i = 0; i < objects.Count; i++) {
			WTPulsatorObject po = objects[i];
			if (po.targetObject == targetObject && po.propertyName == propertyName) {
				po.valA = valA;
				po.valB = valB;
				break;
			}
		}
	}

	public void HandleUpdate() {
		if (!isPulsating) return;

		totalTime += Time.deltaTime;
		for (int i = 0; i < objects.Count; i++) {
			WTPulsatorObject po = objects[i];
			po.halfTimer += Time.deltaTime;
			po.Refresh(bpm);
		}
	}
}

public class WTPulsatorObject {
	public float halfTimer = 0;
	public object targetObject;
	public float valA;
	public float valB;
	public float numBeats;
	public bool isPulsatingUp = true;
	public string propertyName {get; private set;}

	private Action<float> setter;

	public WTPulsatorObject(System.Object targetObject, string propertyName, float valA, float valB, float numBeats = 1) {
		this.targetObject = targetObject;
		this.numBeats = numBeats;
		this.valA = valA;
		this.valB = valB;
		this.propertyName = propertyName;

		setter = GoTweenUtils.setterForProperty<Action<float>>(targetObject, propertyName);
	}

	public void Refresh(float bpm) {
		if (halfTimer > 30.0f / bpm * numBeats) {
			halfTimer -= 30.0f / bpm * numBeats;
			isPulsatingUp = !isPulsatingUp;
		}

		float percentage = halfTimer / (30.0f / bpm * numBeats);
		if (!isPulsatingUp) percentage = 1 - percentage;
		
		float newVal = percentage * (valB - valA) + valA;
		setter(newVal);
	}
}

WTPulsatorTest.cs

using UnityEngine;
using System.Collections;
 
public class WTPulsatorTest : FStage {
  WTPulsator pulsator;
 
  public WTPulsatorTest() : base("") {
		pulsator = new WTPulsator(120);
 
		for (int i = 0; i < 50; i++) {
			FSprite s = new FSprite("circle");
			s.scale = Random.Range(0.1f, 1.0f);
 
			s.x = Random.Range(s.width / 2f, Futile.screen.width - s.width / 2f);
			s.y = Random.Range(s.height / 2f, Futile.screen.height - s.height / 2f);
 
			s.color = new Color(Random.Range(0.0f, 1.0f), Random.Range(0.0f, 1.0f), Random.Range(0.0f, 1.0f), 1.0f);
 
			AddChild(s);
 
			pulsator.AddTargetObject(s, "scale", s.scale / 2.0f, s.scale);
		}
	}
}