ite.scale.set(1,1,1).multiplyScalar( tweenScale(0) )
		material.opacity= tweenOpacity(0)

		var birthDate	= now;
		var callback	= loop.hook(function(delta, now){
			var age	= now - birthDate;
			if( age >= maxAge ){
				sprite.parent.remove(sprite)
				loop.unhook(callback)
				return;	
			}
			sprite.scale.set(1,1,1).multiplyScalar( tweenScale(age) )
			material.opacity= tweenOpacity(age)
//			material.color.setHSL( (age/maxAge) * 0.22 + 0.90, 1, 0.5 );
		})
	});
	function createTweenMidi(maxAge, attackTim