Pedals that stack with the Carl Martin Chorus XII

MXR Distortion+

MXR Distortion+ leans toward compressed, and that's a real, usable character to pair with

Beetronics Swarm

What Beetronics Swarm brings here leans toward fuzzy — that's worth building a pairing around

Roland SDE-3000D

Keep Carl Martin Chorus XII's modulated voice out front: Roland SDE-3000D goes after Carl Martin Chorus XII in the signal chain so its pristine voice doesn't muddy it — goes in the amp's FX loop (or last, into a clean amp)

Alexander Pedals Radical Delay

Alexander Pedals Radical Delay's pristine voice goes after Carl Martin Chorus XII in the signal chain — it's not there to compete with Carl Martin Chorus XII's own modulated character — goes in the amp's FX loop (or last, into a clean amp)