Pedals that stack with the Randall RRM 2-200

Fulltone OCD Obsessive Compulsive Drive

The high headroom tone has headroom to spare — Fulltone OCD Obsessive Compulsive Drive gives it fuzzy to fill it with

Carl Martin Hot Drive'n Boost MK3

Run Carl Martin Hot Drive'n Boost MK3 into that high headroom platform and it finally gets some high gain

Tone City Model B Distortion TC-T31

Tone City Model B Distortion TC-T31's high gain fills in what this high headroom tone doesn't make on its own

Maestro PS-1A Phase Shifter

Keep Maestro PS-1A Phase Shifter after Randall RRM 2-200 in the signal chain, clear of Randall RRM 2-200's own gain stage

Lab Ratz 3D Boum Warming Unit

Lab Ratz 3D Boum Warming Unit's own low gain character is the real reason this is worth trying

Binson Echorec Delay

Binson Echorec Delay's saturated voice goes in Randall RRM 2-200's effects loop — it's not there to compete with Randall RRM 2-200's own high headroom character — goes in the amp's FX loop (or last, into a clean amp)

Fender Hammertone Reverb

Keep Fender Hammertone Reverb in Randall RRM 2-200's effects loop, clear of Randall RRM 2-200's own gain stage — goes in the amp's FX loop (or last, into a clean amp)