I discovered too late that it was hard to allow the sound effects to play on demand, so I had to make do. So it's not the best user experience.
Basically whenever you activate the first music note tile a sound effect plays, and when one is flipped up it also plays. When two are flipped up each one plays on a different side of the stereo channels. I didn't have time to volume level the sounds effects anymore so they can be a bit hard to hear.