Channel 3, the top row with a red LED, is a variation on another boost voicing Thordendal favours. Channel 33, the bottom row with a green LED, is the original 33 circuit with added controls. Each channel has Volume plus active Bass and Treble, and the CH 3/33 footswitch selects between them.

A built-in Zuul noise gate has its own mini knob. The gate is keyed from the input signal, so its tracking does not change when the channel controls move. A side jack connects to an amplifier's channel footswitch input; one switch chooses whether the ON or CH 3/33 footswitch changes the amp channel, and a polarity switch (N.C./N.O.) corrects a reversed channel selection.

Bypass uses a DPDT relay, and the pedal powers up in the on or off state it was left in. Digital modelers have level-sensitive inputs, so high Volume settings can overload them.