Music controller, sound generator etc.

Electronics Infoline Web

Natural Sound Effect Melody Generator

http://www.qsl.net/vu2upx/Projects/Melody%20generator.htm

http://www.paia.com/syndrum.htm

a motorized potentiometer using a stepper motor for remote controlling/positioning of a standard audio preamplifier volume potentiometer

http://home1.stofanet.dk/hvaba/steppervolume/stepper.html

example circuits.

http://www.solorb.com/anhevn/

http://www.aaroncake.net/circuits/organ.htm

little circuit that can play 8 note tunes at any speed you want.

http://www.aaroncake.net/circuits/music.htm