Check the listing for details. Tech 21 SansAmp RBI Bass Preamp. Condition: Very Good - Refurbished. Listed at 341.10 USD. The Rackmount SansAmpJust like its exceptionally popular pedal predecessor, SansAmp RBI offers you an entire sound spectrum of the most coveted traditional and modern bass amp systems - including mondo overdriven tones that typically require a complex mass of gizmos that weren't even designed for bass in the first place. Sample settings, such as SVT- style, Bassman-style, King's X-style, and Crimson-style (to name a few) are included in the owner's manual to get you started.Familiar controls Drive adjusts the overall amount of gain and overdrive; Presence brings out the upper harmonic content and attack; Blend allows you to mix the direct instrument signal with SansAmp Tube Amplifier Emulation circuitry; and active Bass and Treble controls cut or boost +/-12dB.