The Box of Rock is Z.Vex Effect’s first distortion pedal, designed to simulate the ‘everything on 10’ sound of a classic Marshall® JTM45 non-master-volume amplifier. The Box of Rock behaves so much like the front end of a vintage Marshall® tube amp that once you’ve set your maximum needed drive on the pedal, you can use your guitar’s volume control to adjust the exact amount of distortion you need. All the way down to very clean and clear with most drive settings.
The Box of Rock also contains an extremely high-head room, unity-to-50X gain booster with nominal input impedance and low hiss. It is very similar to the SHO boost circuit, with refinements to make it sound more like a standard amp input and less glassy. The boost channel can be used alone or in conjunction with the distortion engine channel. The boost channel follows the distortion channel so that the distortion is able to hit your amp harder.