Hi Bob
A simple, science free, answer might be;
Delay gives a repeat of whatever is fed into it, the number of repeats being generally determined by a feedback control.
Reverb, generally, simulates an environment such as, Hall, Room, Ambience, but also electronically created effects such as, plate and spring. The latter is probably the one you have on your amp.
And so, to demonstrate.....
Delay. ......ECHO....echo
Reverb......ECHOOooooooo.
Hope this helps.
Although I've not come across the TC Flashback, I'd vouch for the quality of their products. I've been using their delays for years.




