VOX StompLab IIB MULTI-EFFECT FLOOR FLOOR BASE FOOTSWITCH for bass. The StompLab series of effects pedals is an impressive advance in powerful sounds in a compact and sophisticated metal body. Sound variations are classified by style, such as rock, blues and ballads, making it easy, even for inexperienced users, to select the desired sound. Effects number: StompLab IIB: 61. Number of Programs: 120 (User = 20 / Preset = 100). Audio input: 1 (Mono). Audio Out: OUTPUT / PHONES (Stereo). Signal Processing: A / D Conversion: 24-bit, D / A Conversion: 24-bit. Tuner: Tuning range: A0 - E6, Calibration range: A = 438 Hz? 445 Hz. Power: AA x 4 batteries, DC 9V (Optional: AC adapter). Battery Life: 7.5 hours (Alkaline battery).