"CUTOFF, RESONANCE, AMOUNT, MIX, all of which are stereo 1/4" jacks that accept moogerfooger EP1 (or equivalent) expression pedals, or control voltages from either two-circuit or three-circuit 1/4" jacks." 0-5V control voltage was generated by a PIC based LFO. At 4:00 the "cut-off frequency" and at 7:37 the "mix" is modulated by the LFO.
Moog Moogerfooger MF-101 Low Pass Filter by FR3QU3NCY 50C13TY