Just as another data point for the group, I use Behringer VIrtualizers
on my Rodgers 660 vs. a straight reverb unit like the Alesis. They have
various room modeling features that go far beyond simple reverb (kind of
a poor-man's Rodgers RSS), and I find the ability to manipulate the
sound field across the two channels per unit makes the organ sound like
it's in a much bigger space than my 16x24 living room. Jean has heard
my setup last time he was at my house.
I simply insert the Virtualizers in the line-level feeds between the
output panel and the amp inputs. I've selected the appropriate channels
on the organ for each unit's channel pair so that I can 'spread' the
sound proportionally across the speakers for both channels, which are
placed on opposite sides of the room end wall. Each channel/division
still maintains a dominant location in the room via it's primary
speakers, but a small amount also appears in the other channel's
speakers, making the sound field for that channel much broader that it
would be otherwise.
As I add more salvaged Rodgers racks to the 660 over the next year to
de-unify it somewhat, I'll also add more channels in the same manner.
Just my $0.02 worth.
Tom Nelson Milford, NH