If you've got a crusty on TI SN76477 hanging around the parts bin, Thomas Henry and I worked up a new application for it. It's a voice module with noise/pulse, triangle, EG and LFO outputs.
Unlike most SN76477 projects, this is not just a dedicated weird noise maker (though it'll do that, too). Thomas put a V/Oct expo converter on it, and it tracks well enough for keyboard use.
Schematics, circuit details, samples are here:http://mypeoplepc.com/members/scottnoan ... /id22.html