I have an acoustic pick-up for my guitar w/ 1/4 to 1/8 adapter. It barely works. The input signal is too weak. I thought I might have to purchase the MobilePre from M-Audio, but it seems like a rip-off compared to TASCAM's US-122. The US-122 provides MIDI, XLR, and 1/4 guitar inputs all in a little box powered by USB(and with Phantom power none the less). The MobilePre is $150 The US-122 is $200 Does anyone have advice before I junk off $200?