Pedals that stack with the Gallien-Krueger MB-212 II Bass Combo 500 watts

Ashdown Geezer Butler Signature

Into a transparent tone, Ashdown Geezer Butler Signature brings the low gain it's missing

ThorpyFX The Dane

Run mid-forward into ThorpyFX The Dane for more fuzzy on top

Zvex Fuzz Probe

Zvex Fuzz Probe stacks fuzzy on top of the mid-forward already here

Boss BF-2 Flanger

Boss BF-2 Flanger's analog warmth voice goes after Gallien-Krueger MB-212 II Bass Combo 500 watts in the signal chain — it's not there to compete with Gallien-Krueger MB-212 II Bass Combo 500 watts's own mid-forward character

Wren and Cuff Gold Comp

What Wren and Cuff Gold Comp brings here leans toward germanium — that's worth building a pairing around

EarthQuaker Devices Afterneath

Run EarthQuaker Devices Afterneath in Gallien-Krueger MB-212 II Bass Combo 500 watts's effects loop, clear of Gallien-Krueger MB-212 II Bass Combo 500 watts's own gain stage — goes in the amp's FX loop (or last, into a clean amp)

EarthQuaker Devices Afterneath V2

Run EarthQuaker Devices Afterneath V2 in Gallien-Krueger MB-212 II Bass Combo 500 watts's effects loop, clear of Gallien-Krueger MB-212 II Bass Combo 500 watts's own gain stage — goes in the amp's FX loop (or last, into a clean amp)