To switch instruments, move your mouse to the left of the project and press 1,2, or 3. to play a sound, place your mouse anywhere but the colored area of the screen and press 1,2, or 3. I'm actually surprised by how easy this is. The things that aren't in the main loop are unnesesary, but make everything a bit nicer. really, the project runs in about one script! credit: scratch sound library
