Pedals that stack with the Spaceman Mercury IV Germanium Harmonic Boost

Tech 21 SansAmp

Tech 21 SansAmp's bright balances out the warm tone

MXR Distortion+

MXR Distortion+ leans bright right where the warm tone needs it

Boss CE-1 Chorus Ensemble

Boss CE-1 Chorus Ensemble's lush voice goes after Spaceman Mercury IV Germanium Harmonic Boost in the signal chain — it's not there to compete with Spaceman Mercury IV Germanium Harmonic Boost's own germanium character

Boss BC-1X

Boss BC-1X's own compressed character is the real reason this is worth trying

Boss DD-200 Digital Delay

Keep Boss DD-200 Digital Delay after Spaceman Mercury IV Germanium Harmonic Boost in the signal chain, clear of Spaceman Mercury IV Germanium Harmonic Boost's own gain stage — goes in the amp's FX loop (or last, into a clean amp)

Roland SDE-3000D

Put Roland SDE-3000D after Spaceman Mercury IV Germanium Harmonic Boost in the signal chain, clear of Spaceman Mercury IV Germanium Harmonic Boost's own gain stage — goes in the amp's FX loop (or last, into a clean amp)