Crumar DC2? Is it an analog synth?
Playing with a Synthex must be a rewarding experience, I whish I could do that someday.. or maybe play with a VCS3 (do BoC has one of these??).
Yes the Crumar DS2 is an analogue mono synth with a limited (but very cool poly section) . Most of them have a filter input , so you can run external sounds through it .The Crumar DS2 filter section is awesome .
I'm like anyone else in that I don't know for sure what their musical equipment list is , so the VCS3 idea is anybody's guess . I have never used one , but judging by famous recordings that feature that instrument ,I would say probably not .
As mucephei said, it could be a MS20 . The MS20 has great resonant low and high pass filters which are great for tracking through - very BOC sounding to my ears .
Still , If I was pressed to say what techniques they use, I would say sampling ,tape-recording, analogue compression ,re-sampling , sub-mixing ,subtle phase shiting , LFO's modulating pitch and filters and tons of other stuff before the use of any one analogue synthesizer .