Cool little effect/DonPetersen challenge :P

More likely it could be done with a combination of Wah/Resonator blocks. I've done something similar on the Ultra.
 
that is a pretty cool sound! :eek: like a wah....yet not! lol

compared to the un-effected sound, there is clearly something more going on there than more than just a filter sweep....almost like if there's some kind of distortion and tubescreamer inside.....
 
What I hear is a very sharp (high Q) peaking (not bandpass!) filter driving a gain stage for dirt and compression, which in turn hits the input of the amp following it quite hard.

but I might be wrong...

edit:
the Q also seems to vary with the frequency
 
i think don's hit it on the head. i hear a slight octaving fuzz thing going on too. perhaps the octave fuzz on full tilt but not on full mix might get you there too

sim
 
that's based on the rare Systech Harmonic Energizer. Zappa famously used one and IIRC, Dweezil dialed it in for his Ultra rig. so definitely possible to do.
 
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