I've been using an AKAI Headrush and am really pleased with it. It's
supposed to be a digital replica of something like a space echo/
echoplex deal. You have 4 different outs for each of the "heads" and
can change the timing gap between them all. Really nifty. Plus, it
has
a loop record mode, or you can use it as a standard 24 second delay
line! I also have an old Digitech 1900 delay that has a CV in.
Haven't
tried using the cv yet (it's ancient and grungy as heck), but I'll
give
it a try and let y'all know the results.

-andrew bunny