ever since i purchased my mbox 2 mini i have had a problem getting decent volume from my mics through the low-z xlr input. both of the 1/4" line inputs work fine when plugged into a guitar amp. the mbox 2 mini is supposed to have a preamp on the xlr input but i have to crank the gain up to 10 to hear anything from both of my mics. (when the gain is on 10 the noise floor is quite high too) i own two different dynamic mics: Shure SM57 & Nady Starpower cheap thing. what should i due to get some more gain? should an external mic preamp do the trick, even though the xlr input has a built in preamp? (there is no way around the internal preamp on that channel) should i use an external micpreamp into a line level input instead? any other ideas? thanks in advance! let me know if i left out any useful information in solving this problem.