Pedals that stack with the EarthQuaker Devices Hummingbird V4

MXR Distortion+

MXR Distortion+'s own compressed character is the real reason this is worth trying

Univox Super-Fuzz

Univox Super-Fuzz's own octave character is the real reason this is worth trying

Roland SDE-3000D

Run Roland SDE-3000D after EarthQuaker Devices Hummingbird V4 in the signal chain, clear of EarthQuaker Devices Hummingbird V4's own gain stage — goes in the amp's FX loop (or last, into a clean amp)

Alexander Pedals Radical Delay

Keep EarthQuaker Devices Hummingbird V4's modulated voice out front: Alexander Pedals Radical Delay goes after EarthQuaker Devices Hummingbird V4 in the signal chain so its pristine voice doesn't muddy it — goes in the amp's FX loop (or last, into a clean amp)