TC Electronic Hall of Fame Mini Reverb - Manual (Page 11)

Choosing the right setup
Hall of Fame Mini Reverb 9
“I want my reverb to trail out when I use my volume pedal!”
Awesome! In that case, place your volume pedal before Hall of Fame Mini Reverb in the signal path so the pedal can work its magic.
Modulation &
Delay Pedals
Looper
Pedal
Combo
Input
Drive
Pedals
▲
Your volume pedal goes somewhere over here if you want
your reverb to trail out when lowering the volume.