Behringer DW400 Dynamic Wah Ultimate Auto-Wah/Human Voice Effects Pedal The ultimate Auto-Wah/Human Voice effects pedal to create classic wah effects and unbelievable human-voice, "talking" sounds Real Sound Modeling (RSM) combines state-of-the-art DSP technology with sophisticated algorithms to emulate real acoustic environments Take off with incredible auto-wah sounds that can be controlled manually, via tap-tempo mode or expression pedal (not included) Dedicated Mode, Sensitivity, Manual and Decay controls for awesome sound shaping Blue status LED for effect on/off and battery check