I stand corrected!
You're right - the manual says it has a "sensitivity circuit" that's apparently designed to open automatically instead of according to the amplitude of the input. I should be ashamed to call myself FilterFunk!


It's been many years since I owned one; my memory of it is faulty.
I know MXR already has a hit with the Bass Envelope Filter, but judging from the many demos, it's not my kind of flavor. I'd love to see MXR make a version of the Bass Auto Q that ditches the LFO, keeps the Range, Q, Volume and Decay, and adds a dedicated Sensitivity control knob, then put it into a smaller enclosure. I know I'd buy it!