If there's anyone out there that's familiar with this bass and these controls
https://www.sire-revolution.com/product/sire-marcus-miller-m2/
Can they explain how they work? They don't seem to do anything, whether or not in passive or active. Admittedly I have a crappy guitar practice amp right now, so I don't expect audio miracles, but surely they are meant to do something? Everything else seems to work fine and sounds ok so I can't imagine there's a fault.
Thanks