Been mounted on my board for a good few years, just moving in a different direction. Only thing out there that can bi-amp within one box. Over £320 new today. Comes with box and power supply, but I’m currently powering through my CIOKS without issue. 

The Bass Butler is a bi-amp preamp pedal that gives bassists the best of both worlds — thunderous clean low end and gritty, guitar-style distortion — at the same time. Designed to replace an entire amp rig or just act as a preamp pedal, it splits your signal into two paths: a clean, full-frequency bass channel and a gain-laden guitar channel, each with its own EQ and volume controls. Perfect for players who want studio-ready tone without the stage clutter, the Bass Butler also includes individual cabinet-simulated balanced outputs for front-of-house or recording, plus a dry output for full routing flexibility. Just plug in and let the Butler serve your sound.

INDEPENDENT CLEAN AND DIRTY CHANNELS
Bass and guitar-style preamps run in parallel, delivering full tonal range with added gain and grit.

CabSim XLR outputs for each channel
CABSIM XLR OUTPUTS FOR EACH CHANNEL
Send clean and dirty tones separately to FOH or your recording setup, with no extra gear or mic required.

Compressor and EQ on bass channel
COMPRESSOR AND EQ ON BASS CHANNEL
Studio-style tone shaping and tight dynamics for clarity, punch, and low-end control.

Dry and amp outputs for full flexibility
DRY AND AMP OUTPUTS FOR FULL FLEXIBILITY
Route your signal however you like: front-of-house, interface, amp, DI, or all at once.