1. Make a servo swing back and forth. Play a sound at each end of its range.

2. Make a single LED grow brighter, play a note at the end of its range, then start growing dimmer again. When the light is completely out, play another note, then start making it brighter again. (Watch out for timer collision issues, we'll discuss)

3. Modify #2 so that you can use two buttons; one should increase the brightness while you're holding it down, and the other should decrease the brightness.