I started yesterday doing the tuning, following your advices.

I'm having trouble when doing the tuning of the filter, in particular when I have to compare the noise to the note played by half of the VCO 2 (initial frequency calibration). It is not so straight to do it by hear and even using an external tuner in my DAW it doesn't get precisely the pitch of the noise.

This is true for both 2pole and 4pole filters.

The next step, volts per octave calibration of the filters, is affected by the same problem, I know how to tune an instrument but I'm in trouble finding the pitch of the noise or comparing it to the sound of the VCO.

Then I have another question, when it comes to tuning the resonance, I was surprised to see that both the filters can actually self resonate, I think they are supposed not to without a mod, but actually I can clearly distinguish the self resonance from the sound of the VCOs.

Why the manual tells to tune the resonance just before hearing something, so before making them selfresonating when resonance is turned fully clockwise (The sound of the self resonance get's strong only when track is selected, is quite without).

Thanks!

Walter