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DOD FX17 Wah/Volume Question

Anyone have one of these? I'm trying to figure out if there's something wrong or it's just because it's not voiced for bass.

While on the wah mode I notice that if I adjust just the volume or sweep trim pot the wah doesn't work at all until I move the other. I notice that when this happens If I strum a string and rotate the volume trim eventually I'll hear the note, at this time moving the pedal will affect the tone, but again only a small part of the motion.

So, I have to alternate turning both trim knobs:

Turn just sweep trim (no sound), turn volume trim.
|---------80% nothing ------------|--20% effect ----|

Turn just sweep more (no sound), turn volume trim more
|----60% nothing---|--20% effect ---|--20% nothing --|

etc... does that make sense? It's hard to describe.