Forgive the necro-bump for a quick update. I tweaked the preset above to have a Resonance value of 0. The idea was to create stacked, ‘semi-parametric EQ’ to tune in frequency ranges, in a more subtle sense. It certainly achieves that, but with a twist.
Rapid expression pedal movement actually ‘bends pitch’. Only the frequency spectrum carving is apparent at parked positions (no pitch shift). I assume the pitch bending phenomenon is due to allpass filter modulation, when mixed with some dry signal.
Cool, unexpected stuff.