I've got a small unpowered mixer with two mic preamps on it. It's also got two stereo channels on it that will accept anything with line-level input. However, I've got four dynamic mics, so I need a way to preamp the other two. I'm considering the M-Audio Audio Buddy ... two independent mic preamps with both XLR and 1/4" in and 1/4" balanced out for $50 at Guitar Center. Does anyone have any experience with this unit and know if it would be suitable to use in a live performance situation? (I have no interest in recording with it.) Or would I be better advised to buy another mixer with four mic preamps (around $100) and keep my current one as a backup? Many thanks!