That brought on a real nice sustain much like turning up those Deluxe amps for a natural tube overdrive

On it's own - just a distortion pedal with a "mic'd up cabinet", super gain, super sustain feel to it - it's great.

On a clean channel'd amp - by itself - this pedal has enough smooth gain and sustain to be the only dist

Finally, there are Level and Gain knobs that work as if they were the corresponding knobs on your amp.

I've found some nice guitar tones with this, but for me it has not been as useful as, for example, Joyo's American Sound, which is more versatile and effective