Anyone tried one of these on bass? All the reviews out there are from guitar players. How clean and how subtle of a boost can you get with one of these on bass? SFX-01 Pickup Booster Pedal The first effects pedal designed specifically to work together with the pickups in your instrument to achieve optimum gain and resonance for all your tonal applications. Turn the knob to dial in pure, flat-EQ gain, ranging from 6dB, all the way to an astonishing 25dB! In addition, the Pickup Booster can add thickness to a single coil pickup. By engaging the Resonance Switch, the resonant peak of a single coil pickup can be lowered, making a Strat® pickup sound similar to a vintage humbucker or even a high-output humbucker.