The Dr. Z Z Drive pedal was developed with input from EarthQuaker Devices’ Jamie Stillman. It uses OPA 2134 op amps and has two drive channels; Germanium uses NOS diodes and is a lighter, more open-sounding overdrive, while Mosfet creates a more-compressed, higher-gain tone. The channels have separate controls for Drive, Level and Cut, and share an active three-band EQ. It’s powered by a 9-volt DC.