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? If I used said Brick from said uke to said amp (without DI), would this reduce or increase feedback? What about with DI? Remotely related: I like ukes better because there are less strings. Thanks!