Pedals that stack with the EarthQuaker Devices Fuzz Master General

Zvex Seek Trem

Run Zvex Seek Trem after EarthQuaker Devices Fuzz Master General in the signal chain, clear of EarthQuaker Devices Fuzz Master General's own gain stage

Z.Vex Super Hard On

Z.Vex Super Hard On layers clean boost onto an already fuzzy signal

Aguilar Octamizer (Bass Octaver)

Aguilar Octamizer (Bass Octaver) stacks octave on top of the fuzzy already here

Strymon OB.1 Bass

What Strymon OB.1 Bass brings here leans toward clean boost — that's worth building a pairing around

Pigtronix Echolution

Keep EarthQuaker Devices Fuzz Master General's octave voice out front: Pigtronix Echolution goes after EarthQuaker Devices Fuzz Master General in the signal chain so its modulated voice doesn't muddy it — goes in the amp's FX loop (or last, into a clean amp)

Walrus Audio Melee Wall of Noise Black

Run Walrus Audio Melee Wall of Noise Black after EarthQuaker Devices Fuzz Master General in the signal chain, clear of EarthQuaker Devices Fuzz Master General's own gain stage — goes in the amp's FX loop (or last, into a clean amp)