This listing is for a Riemann's Grave Multimode Distortion + Filter pedal from Discomfort Designs.

The goal of Riemann’s Grave is basically to have one side that creates lots of interesting harmonic content through distortion, and then sculpt all those harmonics with the filter.

On the right side of the pedal (Zeta Function) is a three-mode distortion (waveshaping, bit crushing, and octave distorting). On the left, a resonant state-variable filter (band pass, ladder style low pass, and high pass) that can be static, modulated randomly, or modulated with a Wandering Sine. There’s also a ‘JITTER’ knob, which will wiggle some of the other parameters randomly.