Question It doesn't seem to make much of a difference where I set the Gain knob on my Röttweiler pedal. Is it faulty

The Gain knob on the Röttweiler distortion pedal is not designed to go from clean sound to maximum distortion but rather to provide more/less saturation of the distortion sound, similar to a cranked tube amplifier. However, if you turn the Gain knob fully counter-clock wise, lower the volume on you guitar and pick/strum softly, you can get a cleaner sound out of the pedal.