just click any of the buttons to play a sound, you can also click the megaphone icon to mute the sounds. The music button makes a "fullscreen" window pop up that has a small demo of an audio sequence (see the code) clicking the background closes the window
so, i have never worked on a sound engine before and i dont really know HOW one works so this is my take on it. (look in the code) this is for emerald os 25 hope this small sound engine helps