Turtlerock Forum

These units were pretty popular in the eighties. Although it has the word "digital" on the front, the MKS-20 actually has a few nice-sounding analogue components to it's sound - the BBD chorus, the panning tremolo, and the EQ.

I've found it wasn't too hard to mod it to accept external audio to the analogue section..

http://www.adambaby.com/studiotech_MKS20.html