I was sent off on a sidequest by
@Charlie Tuna , who had a non-dirt pedal delivered to my doorstep:
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Any pedal is a dirt pedal if you set the gain high enough.
This, however, is a filter pedal. A super filter pedal. It has two of them.
right to left, you can configure your filter. High pass, low pass, band pass or notch filter - then set the Q of the filter, and the center frequency. The filter gain knob sets the resonance (I think). Then come the confusing knobs. When you're running only filter A (selected by the switch on the bottom), the leftmost knob sets the mix between your dry signal and the filter. Fully CCW is wet, fully CW ist dry. When you use both filters it is confusing, and I still need to figure out what exactly happens. The loner on the lower left is a pre gain that can make a dirt pedal out of the thing, it's at unity fully CCW.
While others might instantly gleam what great opportunities slumber in this device, I went about it a little more blockheaded.
Charlie Tuna not only sent me the manual and stood by with advice, I actually forced him to bring out the crayons and paint it for me, using tiny, friendly words until I slowly approached this topic from the right side.
Give me a filter, and I set it to HP, pick a frequency by ear and then slam it with a bass knob turned up way too high on some pedal that comes before it in the chain. But this one does it all on its own. It's super intuitive.
You want to be better endowed "down there"?
Simple. Set the Switch to "A", then you pick the HP, which is short for High Pass, often described as Low Cut. You leave the Q alone for now and pick the frequency you absolutely have no wish to cut, somewhere just above the 75Hz mark. Then you set the filter gain to a point north of noon, and that will create a resonant spike at the point where the filter starts. The mix knob stays at noon, ensuring a 50/50 mix of dry and wet signal, thus eliminating the filter effect of the filter, leaving only the resonant spike. With the Q knob, you can now adjust how steep the slope will be, and the result will be your signal, but with a resonant spike in the just-over-75Hz area, and therefore a thicker sound.