Pedals that stack with the Matthews Effects The Engineer

Cordovox PH-8

Keep Cordovox PH-8 after Matthews Effects The Engineer in the signal chain, clear of Matthews Effects The Engineer's own gain stage

Aguilar Octamizer (Bass Octaver)

Run fuzzy into Aguilar Octamizer (Bass Octaver) for more octave on top

Fender Blender

Put Fender Blender in front and the fuzzy tone leans further toward octave

Hungry Robot The Borderland

Hungry Robot The Borderland's modulated voice goes after Matthews Effects The Engineer in the signal chain — it's not there to compete with Matthews Effects The Engineer's own fuzzy character — goes in the amp's FX loop (or last, into a clean amp)

Electro-Harmonix Stereo Memory Man Vintage

Run Electro-Harmonix Stereo Memory Man Vintage after Matthews Effects The Engineer in the signal chain, clear of Matthews Effects The Engineer's own gain stage — goes in the amp's FX loop (or last, into a clean amp)

Jackson Audio Bloom V2 Compressor/EQ

Jackson Audio Bloom V2 Compressor/EQ's own transparent character is the real reason this is worth trying