Pedals that stack with the MXR Poly Blue Octave

Cordovox PH-8

Run Cordovox PH-8 after MXR Poly Blue Octave in the signal chain, clear of MXR Poly Blue Octave's own gain stage

Walrus Audio Ages

Walrus Audio Ages layers clean boost onto an already fuzzy signal

Fender Blender

Put Fender Blender in front and the fuzzy tone leans further toward octave

Pigtronix Echolution

Keep Pigtronix Echolution after MXR Poly Blue Octave in the signal chain, clear of MXR Poly Blue Octave's own gain stage — goes in the amp's FX loop (or last, into a clean amp)

Walrus Audio Melee Wall of Noise Black

Keep Walrus Audio Melee Wall of Noise Black after MXR Poly Blue Octave in the signal chain, clear of MXR Poly Blue Octave's own gain stage — goes in the amp's FX loop (or last, into a clean amp)

Jackson Audio Bloom V2 Compressor/EQ

Jackson Audio Bloom V2 Compressor/EQ leans toward transparent, and that's a real, usable character to pair with