The Supa-Boost is a "clean" boost pedal, it does not distort the signal. Instead, it becomes like an extra gain stage in your amp, pushing it to do more of what the amp already does. Add up to 20db of gain and frequency shaping to your signal before it hits the amp. You'll hear even order harmonics stack up even without adding signal gain. You'll also find your amp retains more clarity when rolling back your guitar volume.