Pedals that stack with the Mad Professor Fire Red Fuzz Hand Wired

Cordovox PH-8

Run Cordovox PH-8 after Mad Professor Fire Red Fuzz Hand Wired in the signal chain, clear of Mad Professor Fire Red Fuzz Hand Wired's own gain stage

Fender Blender

Fender Blender stacks octave on top of the fuzzy already here

Aguilar Octamizer (Bass Octaver)

Aguilar Octamizer (Bass Octaver) layers octave onto an already fuzzy signal

Hungry Robot The Borderland

Run Hungry Robot The Borderland after Mad Professor Fire Red Fuzz Hand Wired in the signal chain, clear of Mad Professor Fire Red Fuzz Hand Wired's own gain stage — goes in the amp's FX loop (or last, into a clean amp)

Electro-Harmonix Stereo Memory Man Vintage

Keep Mad Professor Fire Red Fuzz Hand Wired's fuzzy voice out front: Electro-Harmonix Stereo Memory Man Vintage goes after Mad Professor Fire Red Fuzz Hand Wired in the signal chain so its analog warmth voice doesn't muddy it — goes in the amp's FX loop (or last, into a clean amp)

W-LM Compression Fracture

What W-LM Compression Fracture brings here leans toward compressed — that's worth building a pairing around