
This circuit-bent 3G iPod from 2004 has a bright red LED on the front, a large on/off rocker switch on top, a pitch-bend mod wheel and the ability to play glitchy guitar solos. Check out the link to the sounds it makes below.
A guitar-solo-playing circuit-bent iPod
http://blog.makezine.com/archive/2008/04/circuitbent_ipod_turns_it.html