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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.