[sonicland]

Here's the hitch, the guitar input on the TC is necessary for the unit to know what key the harmonies should be in, so you've got get the guitar signal to the TC. In other words, you would have to get the guitar mic to line level in order to feed the pitch info to the TC.

One way around this, the TC can function as a very capable mixer for a solo guitar/singer. The mic input has excellent fx (eq, verb, compression) and you can pass the guitar signal on to the output with some reverb. I've done some small gigs with just the TC outputs to powered speakers and it sounds fantastic.

If you got an inexpensive mic pre (preferably with some eq) you could plug your guitar signal into the TC (along with you vocal mic) and record the output of the TC into your Audiobox. The output of the TC would be your final mix.

The TC can sound really good and generate some very realistic harmonies but it does take some work and a good bit of practice, and not all types of harmonies work.

Hope that helps!