Pedals that stack with the MXR ZW38 Zakk Black Label Chorus New

Xotic RC Booster

What Xotic RC Booster brings here leans toward transparent — that's worth building a pairing around

Beetronics Buzzter Boost Preamp

What Beetronics Buzzter Boost Preamp brings here leans toward transparent — that's worth building a pairing around

Walrus Audio Fable

Put Walrus Audio Fable after MXR ZW38 Zakk Black Label Chorus New in the signal chain, clear of MXR ZW38 Zakk Black Label Chorus New's own gain stage — goes in the amp's FX loop (or last, into a clean amp)

Benson Amps Delay

Benson Amps Delay's slapback voice goes after MXR ZW38 Zakk Black Label Chorus New in the signal chain — it's not there to compete with MXR ZW38 Zakk Black Label Chorus New's own modulated character — goes in the amp's FX loop (or last, into a clean amp)