The Saturnworks A/B active mixer takes two signal and mixes them to one amp, with on/off switches and volume controls for each channel to allow fine volume trimming.
A downside of passive mixers is that they always have 'cross-talk.' In other words, the level of one channel affects the level of the other. The active A/B mixer pedal uses active circuitry to balance the signals and eliminate cross-talk.
The Saturnworks active mixer pedal features 'pro' footswitches for triple the durability, a sturdy cast aluminum case, heavy duty Neutrik jacks, Alpha potentiometers, and bright LED's that indicate which channels are active. The pedal runs on a standard 'Boss' type 9v adapter.