Pedals that stack with the Subdecay Octave Theory Octave Modulator Synthesizer

MXR Distortion+

MXR Distortion+'s own compressed character is the real reason this is worth trying

Univox Super-Fuzz

Subdecay Octave Theory Octave Modulator Synthesizer's octave character and Univox Super-Fuzz's octave voice sit in the same lane rather than fighting each other

Roland SDE-3000D

Keep Subdecay Octave Theory Octave Modulator Synthesizer's octave voice out front: Roland SDE-3000D goes after Subdecay Octave Theory Octave Modulator Synthesizer in the signal chain so its pristine voice doesn't muddy it — goes in the amp's FX loop (or last, into a clean amp)

Walrus Audio Mako D1 High-Fidelity Stereo Delay V1

Walrus Audio Mako D1 High-Fidelity Stereo Delay V1's pristine voice goes after Subdecay Octave Theory Octave Modulator Synthesizer in the signal chain — it's not there to compete with Subdecay Octave Theory Octave Modulator Synthesizer's own octave character — goes in the amp's FX loop (or last, into a clean amp)