Re: "Official" tuning of VCF
this is probably taken from the TB-303 manual about calibrating the VCF
so here's what it tells:
set the knobs as shown in the picture (ehm look at the manual) iirc it was cutoff and envmod centered, and resonance at max (maybe this explains why they left so much resonance on a bass guitar emulator, for calibrating the filter!!!)
play some C note the oscilations should have a period of 2ms which in other words means a frequency of 500Hz
adjust TM3 accordingly
what the manual DOESN'T say is <when> to take the measurement of the resonant frequency:
1) during the beginning of the note (when the filter envelope peaks)
2) during the end of the note (when the envelope has relaxed down)
3) somewhere in the middle of the filter envelope?!
so without this important detail, the whole "calibration" is a bit WTF..
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