So many forums, it's so hard to choose the right one!

OK, so I'm using a Tascam USB unit to do my tracking with. I want to route the vocals through an external reverb unit: however, the Tascam box doesn't have aux sends/receives, and when I go from output to input, all I get is some feedback (very creative feedback that will tactfully go into the song, so not a wasted effort).

So far the solution is (well, we're going to do it when the band comes back in to-morrow) record the vocals to a tape machine, then run from the tape deck through a delay and onto a new channel in the computer.

Any other ideas?