Bass guitar preamp. Four band active EQ and Contour; Selectable Voicing options for expanded tone shaping; Compressor with variable level, threshold, ratio, attack/release and gain reduction indicator; Chromatic Tuner with large LED display; Overdrive with variable volume and drive level with multiple symmetry and voicing options; Aux Input; Phones output; Direct XLR output with ground lift and Pre/Post selector; USB in/out for direct recording and re-amp capability; Supports GK MBP powered enclosures; Effects send/return; 1/4" line output. Dimensions (W x H x D): 13.55 x 14.3 x 3.65 cm, Weight: 0.68 kg.