Pedals that stack with the Gallien-Krueger MB-210 II Bass combo 350 watts

Ashdown Geezer Butler Signature

Ashdown Geezer Butler Signature's low gain fills in what this high headroom tone doesn't make on its own

Fulltone OCD Obsessive Compulsive Drive

Run Fulltone OCD Obsessive Compulsive Drive into that high headroom platform and it finally gets some fuzzy

Carl Martin Hot Drive'n Boost MK3

The high headroom tone has headroom to spare — Carl Martin Hot Drive'n Boost MK3 gives it high gain to fill it with

Maestro PS-1A Phase Shifter

Put Maestro PS-1A Phase Shifter after Gallien-Krueger MB-210 II Bass combo 350 watts in the signal chain, clear of Gallien-Krueger MB-210 II Bass combo 350 watts's own gain stage

Lab Ratz 3D Boum Warming Unit

Lab Ratz 3D Boum Warming Unit leans toward low gain, and that's a real, usable character to pair with

Binson Echorec Delay

Run Binson Echorec Delay in Gallien-Krueger MB-210 II Bass combo 350 watts's effects loop, clear of Gallien-Krueger MB-210 II Bass combo 350 watts's own gain stage — goes in the amp's FX loop (or last, into a clean amp)

Electro-Harmonix Memory Boy Analog Delay

Keep Gallien-Krueger MB-210 II Bass combo 350 watts's high headroom voice out front: Electro-Harmonix Memory Boy Analog Delay goes in Gallien-Krueger MB-210 II Bass combo 350 watts's effects loop so its modulated voice doesn't muddy it — goes in the amp's FX loop (or last, into a clean amp)