Eric Ambel demonstrates the Z-Drive through a single channel Carmen Ghia and how you can apply it to add 2 additional channels to the amp.
The Z-Drive starts with an active global EQ and gives you a choice between two distinct sounding preamp channels (via the channel footswitch). The germanium channel uses NOS germanium diodes and is a lighter more open sounding overdrive. The mosfet channel is a more compressed, higher gain overdrive. Both gain stages use hi-fi OPA 2134 op amps. Because the signal goes through the EQ first, turning the EQ controls clockwise can increase overall gain/distortion.
With the Z-Drive you essentially get two pedals in one. You can use one channel as a cleaner boost and the second channel for full overdrive or dial in overdrive sounds to bring out the different characteristics of each channel. Between the two channels and the full EQ the Z-Drive will open up a world of possibilities while complementing the tone of your amp.
The Z-Drive was designed in conjunction with EarthQuaker Devices and is assembled at EarthQuaker's facility in Akron, Ohio.