It's a work in progress. The Fender expression pedal and multi-effect switcher control my Fender Mustang GTX-100 amp—I use the reverb and modulation effects in the amp. Feedback welcome! : r/guitarpedals
FENDER EXP-1 Expression pedal | iMusicData
EXP-1 Expression Pedal | Parts
Fender Mustang V Amp Head with 4x12 Cabinet , Expression Pedal, 4 Button Switch | Reverb