A discrete circuit uses individual transistors and components instead of the single op-amp chip found in the standard SD-1. The S/C switch sits between the Level and Drive knobs and picks the voicing.

Standard mode is voiced to match the classic SD-1. Custom mode offers more gain and a different tonal range for players who want more saturation from the same pedal.

The control layout matches the SD-1, with the mode switch as the only addition. A Waza Craft badge on the footswitch plate identifies this version.