So much more than a mere DI box, the BDI21 is also an analog modeling bass preamp/stompbox. We give you authentic V-TONE modeling technology capable of dialing up big vintage tube tones, funky slap sounds, crunchy distortions and everything in-between. You?ll get a truckload of great amps in a single stomp box?from traditional bass amps to modern overdriven amp tones that would typically require a multitude of effects units. Authentic tube emulation circuitry can be mixed with the direct bass signal via blend control. Use presence control for definition and upper harmonics or rely on an ultra-musical 2-band EQ specifically tuned for bass guitars. Use the BDI21 either for direct recording output with tube emulation or as a standard active direct injection box in bypass mode. The output is laid out on ¼' TS or balanced, gold-plated XLR connectors. A ground lift switch eliminates typical ground loop problems, and it runs on a 9 V battery or a DC power supply (not included).