Pedals that stack with the Dunlop MXR M104 Distortion+

Catalinbread Galileo

Run Catalinbread Galileo after it and the dark edge settles into something more bright

Boss CE-1 Chorus Ensemble

Keep Dunlop MXR M104 Distortion+'s compressed voice out front: Boss CE-1 Chorus Ensemble goes after Dunlop MXR M104 Distortion+ in the signal chain so its lush voice doesn't muddy it

Fulltone OF-2 Octafuzz

Fulltone OF-2 Octafuzz's own octave character is the real reason this is worth trying

Boss LMB-3 Bass Limiter/Enhancer

Boss LMB-3 Bass Limiter/Enhancer's compressed voice suits Dunlop MXR M104 Distortion+'s own compressed character

Keeley Vibe-O-Verb

Keeley Vibe-O-Verb's modulated voice goes after Dunlop MXR M104 Distortion+ in the signal chain — it's not there to compete with Dunlop MXR M104 Distortion+'s own compressed character — goes in the amp's FX loop (or last, into a clean amp)

Alexander Pedals History Lesson Vol. 2

Put Alexander Pedals History Lesson Vol. 2 after Dunlop MXR M104 Distortion+ in the signal chain, clear of Dunlop MXR M104 Distortion+'s own gain stage — goes in the amp's FX loop (or last, into a clean amp)