I bought the Boss AC-3 with an Ernie Ball Volume/Pan Pedal to pan my electric guitar between an acoustic guitar sound and the noises in my Digitech RP200A Guitar Processor. Panning the AC-3 with the Digitech adds a whole new dimension to the Digitech.
Then I panned between the Boss AC-3 and my Ibanez BE-10 Bass EQ and plugged in my Steinberger XP-2 bass.
Holy bleeping sheep bleep.
The AC-3 kills the string ringing, the fret noises and the uneven timbre and tone. I can scrape up and down the fretboard and it sounds like a fretless.
Plus the notes are, well, easier to hear. The AC-3 adds an ear-friendly layer of sound when panned with an angry noise box so the sound is comprehensible enough to follow without taking any of the angst out of your squawk squawk gronk boxes.
The "top" knob on the AC-3 can be noisy, so adjust that one last. That's the only down note. The AC-3 is a great guitar pedal to pan with a noise loop, but what it does to a bass is indistinguishable from magic.