The double-tracked riff, from one pair of hands.
Multitracked guitars have long been a studio trick. This pedal brings it to the stage. It adds an extra guitar track next to your dry signal. The algorithm captures the small random differences in time, attack and pitch.
Decide how loose the twin plays
TIGHTNESS sets how much the extra layer varies in time, pick attack and pitch. Turn it clockwise and the layer gets looser. EFFECT sets the level of that layer only. DRY sets your own signal, up to unity gain at full turn.
Two guitarists on one riff
Set DRY and EFFECT so the added layer matches the dry signal in volume. That gives the sound of two guitarists playing the same riff. Turn both up high, and the pedal plays louder when engaged than when bypassed.
After the drive, in the loop or into the DAW
Live, place it after your overdrive or distortion pedals. With an amp's own overdrive, the FX loop can work better. It also feeds a recording interface directly. With True Bypass, it stays out of your tone when off.