For my school, I just bought a Line6 Spider IV 75-watt amp. It is solid state. What would happen if I put the Groovetubes Brick in front of it as a tube pre-amp?

I use a dimarzio acoustic pickup on the inside of my acoustic uke. I plugged my baby into the amp, and there was LOTS of feedback at even low levels on the amp. would using a DI box help remedy this or no?

http://accessories.musiciansfriend.com/product/DiMarzio-Acoustic-Model-For-Acoustic-Guitar-Bass?sku=302720

my local music store had one of these in stock

anyone have any experience with one?

The instrumentation for this project includes one or two vocal tracks, the ukulele with possible overdubbed solo's, djembe, and a bit of other hand percussion.

The only mic's I have available are cheap Nady's that came in a drum package. One DM 80 dynamic, several DM70 dynamics, and two CM85 condensers.