via this auction
"Three GREAT improvements that it had over its keyboard version were:1) External Audio Signal Input that can be passed through its filter, envelope, LFO etc, and mixed with its original synthesizer waveforms
2) An integrated midi-to-CV convertor for controlling another vintage CV/Gate-equipped mono synth
3) 100 memory locations for storing your sounds, over only 7 that were available on the keyboard version."
