Pedals that stack with the Supro Keeley Combo

Boss HM-2 Heavy Metal leans toward full, and that's a real, usable character to pair with

Goes in front of the amp

What Catalinbread Carbide brings here leans toward silicon — that's worth building a pairing around

Goes in front of the amp

Cornerstone Colosseum's own harmonically rich character is the real reason this is worth trying

Goes in front of the amp

Keep Electro-Harmonix Small Stone after Supro Keeley Combo in the signal chain, clear of Supro Keeley Combo's own gain stage

Goes in front of the amp

Run Empress Echosystem in Supro Keeley Combo's effects loop, clear of Supro Keeley Combo's own gain stage — goes in the amp's FX loop (or last, into a clean amp)

Sits in the amp's effects loop

Keep Supro Keeley Combo's gritty voice out front: Benson Amps Delay goes in Supro Keeley Combo's effects loop so its slapback voice doesn't muddy it — goes in the amp's FX loop (or last, into a clean amp)

Sits in the amp's effects loop

Supro Keeley Combo's own gritty character is the real reason this is worth trying

Goes in front of the amp