In the words of JAM Pedals:

The Red Muck puts on a few pounds, grows a new set of sharp teeth and
is out to seduce even the most demanding Muff connoisseurs!

A Fuzz-Distortion pedal, inspired from the circuits of the 71
triangle and the later Red Army / Civil War Muff. Along with our
individual touch, the end result boasts a smoother sound, fatter low
end, pronounced midrange and added tonal flexibility through the
expanded range of the tone knob. The onboard MIX control allows you to
discover your sweet- spot of the Dry / Wet signal ratio, while the
second footswitch turns it into a 2-gain-stage pedal!