The MC404 CAE Wah features dual Fasel inductors with two distinct voices (high-end emphasis or low to mid resonance) and a built-in MXR MC401 Boost/LineDriver for even more flexibility. The MC404 was developed by Bob Bradshaw of Custom Audio Electronics and the Cry Baby design team with the goal of creating a highly versatile wah-wah of top-grade components. Choose between inductors and turn the boost on or off with the side-mounted kickswitches; bright LEDs on each side of the wah indicate operation status. The MC404 boasts true hardwire bypass a long-life CTS potentiometer and internal pots for “Q” and gain adjustments. It is powered by a Dunlop ECB003 AC Adapter or single 9-volt battery.