Mellotronists

I have tried a few real springs and simulated springs.  I prefer plate
reverbs.  I used an EMT plate one time (waaay back) and I would like
to get one or build one.

http://www.sageelectronics.com/bovasound/emt.html

http://www.prosoundweb.com/recording/tapeop/plate/plate.php

re: digital processors (reverb simulators) - Check out T.C. Electronics. 

Clay