Pedals that stack with the Gallien-Krueger MB210MK2

Boss ODB-3

Run Boss ODB-3 into that transparent platform and it finally gets some low gain

Pigtronix Octava Micro

Into a transparent tone, Pigtronix Octava Micro brings the high gain it's missing

EarthQuaker Devices Hizumitas

The transparent tone has headroom to spare — EarthQuaker Devices Hizumitas gives it high gain to fill it with

Dunlop JD-4S Rotovibe

Run Dunlop JD-4S Rotovibe after Gallien-Krueger MB210MK2 in the signal chain, clear of Gallien-Krueger MB210MK2's own gain stage

Xotic SP Compressor

What Xotic SP Compressor brings here leans toward mid-forward — that's worth building a pairing around

Fender Hammertone Reverb

Keep Fender Hammertone Reverb in Gallien-Krueger MB210MK2's effects loop, clear of Gallien-Krueger MB210MK2's own gain stage — goes in the amp's FX loop (or last, into a clean amp)

Old Blood Noise Endeavors BL-44 Reverse

Run Old Blood Noise Endeavors BL-44 Reverse in Gallien-Krueger MB210MK2's effects loop, clear of Gallien-Krueger MB210MK2's own gain stage — goes in the amp's FX loop (or last, into a clean amp)