Pedals that stack with the Spaceman Effects Atlas IV

Wren and Cuff Box of War Small Foot Fuzz

Wren and Cuff Box of War Small Foot Fuzz stacks high gain on top of the mid-forward already here

Wren and Cuff Box of War OG

Put Wren and Cuff Box of War OG in front and the mid-forward tone leans further toward fuzzy

Boss CE-1 Chorus Ensemble

Run Boss CE-1 Chorus Ensemble after Spaceman Effects Atlas IV in the signal chain, clear of Spaceman Effects Atlas IV's own gain stage

Wren and Cuff Gold Comp

Wren and Cuff Gold Comp's own germanium character is the real reason this is worth trying

Fjord Fuzz Mime

Keep Fjord Fuzz Mime after Spaceman Effects Atlas IV in the signal chain, clear of Spaceman Effects Atlas IV's own gain stage — goes in the amp's FX loop (or last, into a clean amp)

Strymon El Capistan

Keep Spaceman Effects Atlas IV's clean boost voice out front: Strymon El Capistan goes after Spaceman Effects Atlas IV in the signal chain so its transparent voice doesn't muddy it — goes in the amp's FX loop (or last, into a clean amp)