Pedals that stack with the Mad Professor Ruby Red Booster

Catalinbread SFT

Run Catalinbread SFT after it and the bright edge settles into something more warm

Fender Bubbler Chorus

Run Fender Bubbler Chorus after Mad Professor Ruby Red Booster in the signal chain, clear of Mad Professor Ruby Red Booster's own gain stage

Xotic BB Preamp

Xotic BB Preamp's smooth balances out the bright tone

Donner Lax Comp

Donner Lax Comp leans toward transparent, and that's a real, usable character to pair with

Line 6 DL4 Delay Modeler

Keep Line 6 DL4 Delay Modeler after Mad Professor Ruby Red Booster in the signal chain, clear of Mad Professor Ruby Red Booster's own gain stage — goes in the amp's FX loop (or last, into a clean amp)

Caroline Guitar Company Kilobyte

Run Caroline Guitar Company Kilobyte after Mad Professor Ruby Red Booster in the signal chain, clear of Mad Professor Ruby Red Booster's own gain stage — goes in the amp's FX loop (or last, into a clean amp)