Making Toys

The POT fades the blue LED in and out,
increases/decreases the blinking speed of the green LED and changes the
speed and frequency of the sound on the speaker.

Source

http://vimeo.com/moogaloop.swf?clip_id=3869964&server=vimeo.com&show_title=0&show_byline=0&show_portrait=0&color=00adef&fullscreen=1