Pedals that stack with the Electro-Harmonix Mainframe

Zvex Seek Trem

Zvex Seek Trem's modulated voice goes after Electro-Harmonix Mainframe in the signal chain — it's not there to compete with Electro-Harmonix Mainframe's own pristine character

Walrus Audio Ages

Walrus Audio Ages stacks clean boost on top of the fuzzy already here

Fender Blender

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

Pigtronix Echolution

Run Pigtronix Echolution after Electro-Harmonix Mainframe in the signal chain, clear of Electro-Harmonix Mainframe'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 Electro-Harmonix Mainframe's pristine voice out front: Walrus Audio Melee Wall of Noise Black goes after Electro-Harmonix Mainframe 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)

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