|The Synthcart is a rather unique title for the 2600 that allows you to play music using a pair of keyboard controllers. Each keyboard controller controls one of the two oscillators in the Atari 2600. You can learn more about the Synthcart and download an MP3 demo of it in action on Paul Slocum's Synthcart web site.
AtariAge sponsored a Synthcart Beat Programming Contest in early 2002 to allow people to create and contribute beats to be included with the Synthcart. Check out the contest page for all the details and listen to all the beats that were submitted!
You can purchase the Synthcart in cartridge form, complete with manual, from the AtariAge Store. The Synthcart is available in both NTSC and PAL veresions.