To use in a line level, effects loop. I have a TC Flashback and it works pretty well, but has some issues, so I want to find something more reliable. Digitech Hardline states it works well in effects loop. I don't want some expensive thing with a ton of presets/parameters like on an Eventide or Boss DD20. Just a simple delay, Analog would be nice. I dig the Carbon Copy but some say it only works at instrument levels. Trying to find out if the Duncan Vapor Trail can work.