Pedals that stack with the Donner Ultimate Comp

Electro-Harmonix Big Muff Pi

What Electro-Harmonix Big Muff Pi brings here leans toward fuzzy — that's worth building a pairing around

Fulltone OCD

Fulltone OCD leans toward full, and that's a real, usable character to pair with

Keeley Halo

Keep Donner Ultimate Comp's compressed voice out front: Keeley Halo goes after Donner Ultimate Comp in the signal chain so its ambient voice doesn't muddy it — goes in the amp's FX loop (or last, into a clean amp)

Walrus Audio Fable

Keep Donner Ultimate Comp's compressed voice out front: Walrus Audio Fable goes after Donner Ultimate Comp in the signal chain so its full voice doesn't muddy it — goes in the amp's FX loop (or last, into a clean amp)