Nigel Mullaney is working composer and DiN Records artist. He's had the Korg Sigma since 1982 (it was first released in 1979), apparently it was used on the Dirty Harry soundtrack.
The Korg Sigma is mono synth with 2 tune-able synth sections, aftertouch and a joystick controlled filter. Whats not to like?
Older Music Machines & the People Who Still Use Them