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Ahhh...that's a snazzy educational machine, then! I can see why there's less VCOs, then...you're trying to get the students to think a bit out of the box, plus you've got the other gear to crosspatch into. Reminds me of one of my assignments as an undergrad; I had to come up with a cluster of sine waves that panned and shifted pitch all as one. Problem is, the ARP 2600 we had as our teaching synth, as you probably know, only has a SINGLE sine output, on VCO2. The key to the problem was in knowing what you could do by 1) using the AR generator as a sine generator by driving it from VCO1's pulse output and some judicious programming and using the o-scope (the other thing that wasn't mentioned in the assignment) to check the waveform, and 2) feeding VCO3's pulse at 50% cycle thru the lag processor, and doing the same o-scope check there, too. Very interesting programming problem, that...and about half of the class (in 1981) couldn't figure it out.