i only listened to the first clip, but to me it sounds like a loose cable. either mic to cable or cable to UA5. i'd put my money on the problem being the cable to UA5. perhaps you just didn't have them plugged in the whole way? or maybe the XLR connectors on the UA5 are loose themselves. only way to find out, though, is to run some tests. set up your rig, hit record, then start checking all your connections.