Play short sound only if button touchdown?

[typhoch2]

Hey I'm building an Piano App. Now I've got 12 Buttons and 12 different Tones.

Every tone is 2-3 seconds and if I play faster, every tone is played till it is on the end. So you have 2 Tone playing at the same time and that sounds very shitty.

So here is an example Code for 1 Button:

- (IBAction)H {
    NSString *path = [[NSBundle mainBundle] pathForResource:@"h" ofType:@"wav"];
	
	SystemSoundID soundID;
	
	AudioServicesCreateSystemSoundID((CFURLRef) [NSURL fileURLWithPath:path], &soundID);
	
	AudioServicesPlaySystemSound (soundID);
}

I hope you can help me.

[typhoch2]

Hm or maybe stop the just played Sound, if another Button is pressed? But I am not figured out, how to do that.

Please help