I have a dead one of these in the junk box somewhere which arrived dead.
If I recall it had a different chip, *Cool Audio* is all I remember.
It's some kind of *current controller chip* where I assume the pot indirectly controls the level. The other 2 chips are TL074 which seem to be wired as buffers.
I did a search and stumbled upon a chap who mentioned there is a design flaw in that chip.
Something along the lines of; If ground is momentary broken while positive potential is still present the chip burns out in a blink. I decided it's likely not worth trying to fix as it may simply blow again.
The owner asked if it was worth wiring up as an old style passive volume pedal but the actual pedal mechanism does not allow full 270 Deg rotation of the pot which means I'd have to redesign a whole new setup. For me it's just not worth the bother as it would be more cost effective to buy a better pedal.
IME, Some Behringer stuff seems to work fine while other gear,, it's a lottery
Phil.