Pedals that stack with the Morley REX Brown OLD Blue WAH

Univox Super-Fuzz

Univox Super-Fuzz leans toward octave, and that's a real, usable character to pair with

ZVEX Fuzz Factory

What ZVEX Fuzz Factory brings here leans toward fuzzy — that's worth building a pairing around

Caroline Guitar Company Meteore

Put Caroline Guitar Company Meteore after Morley REX Brown OLD Blue WAH in the signal chain, clear of Morley REX Brown OLD Blue WAH's own gain stage — goes in the amp's FX loop (or last, into a clean amp)

Empress Echosystem

Keep Empress Echosystem after Morley REX Brown OLD Blue WAH in the signal chain, clear of Morley REX Brown OLD Blue WAH's own gain stage — goes in the amp's FX loop (or last, into a clean amp)