I'm still at my piano site, now the keys are done with CSS as well as pressing the button to change effect. it's all looking good, only problem is that if i don't have a hover state, clicking the key with a mobile doesn't show any effect. so I add a hover state and pressing a key does the trick. my problem right now is that when the piano start, one button is always pressed, and if i press any other key, it just stay clicked. Any idea how to go over this?