TC Electronic Alter Ego Delay - Manual (Page 11)

Choosing the right setup
Alter Ego Delay English Manual Version 2.1 9
“I want my delays to trail out when I use my volume pedal!”
Awesome! In that case, place your volume pedal before Alter Ego Delay so Alter Ego Delay can work its magic.
Modulation
Pedals
Looper
Pedal
Combo
Input
Drive
Pedals
Reverb
Pedals
▲
Your volume pedal goes somewhere over here if you want
your delays to trail out when lowering the volume.