[sdiy] I've made a VCO... On accident...

[Jeff Farr]

While preparing the circuit from an Electronotes filter (VCF1) I was moving 
around some of the jumper wires to twiddle with output schemes. Now, I'm not 
exactly sure what caused the transformation as I havn't replicated it yet, 
but the circuit began acting like a rather nice VCO, the summer showed a 
nice square, the first integrator showed a nice triangle and the second 
integrator showed a nice sine. All responded nicely to CV, with no DC drift 
or other problems I had to work out of the circuit as a VCF. Needless to say 
I became rather excited about the prospect of having a module that could 
switch between 2-pole filter, VCO, and VC-LFO duty (I measured a wide 
frequency range while it was working). Anyone have expirience with this?
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