The ultimate bass synthesizer that reproduces the fat and powerful sound of classic analog synthesizers—at the touch of a footswitch Real Sound Modeling (RSM) combines state-of-the-art DSP technology with sophisticated algorithms to emulate real acoustic environments Take off with 11 cutting Saw, Square and Pulse synth waveforms, Control filter cutoff and LFO rate via expression pedal (not included) Dedicated Mode, Decay/Rate, Resonance, Direct, Effect and Frequency controls for awesome sound shaping Blue status LED for effect on/off and battery check Runs on 9 V battery or the BEHRINGER PSU-SB DC power supply (not included) First-class electronic On/Off switch for highest signal integrity in bypass mode High-quality components and exceptionally rugged construction ensure long life Conceived and designed by BEHRINGER Germany . The BSY600 stomp box has 11 selectable modes from Square to Saw to Pulse synth waveforms… plus FOUR more rotary controls for Effect level, Resonance, Decay/Rate, High-to-Low Frequency and a Direct knob for controlling dry-to-effects output. The integral Real Sound Modeling (RSM) processor enhances your bass or guitar’s tone to the max for truly rich sound quality. Also included, at absolutely no extra charge, are a genuine Really Blue LED that shows power status and battery condition, as well as an electronic bypass footswitch, which maintains signal integrity. You can use our BEHRINGER PSU-SB DC power supply or a 9 V battery to operate the BSY600 BASS SYNTHESIZER.