i had the chance to run this in a controlled environment many times i.e.: i ran the board mixes also giving myself a submix out for the matrix. the only issue is that the ua-5 sum's the audio input. i have found my ua-5 to sound hollow unless your microphone gain is in the prime spot, which is quite hot, adding a line in will not work without distortion. in uncontrolled live environments i.e. live where your mostly ending up with xlr, 1/4", or RCA Main outputs from the soundman (by nature not always a good sounding mix) i found that some frequencys had a overdriven effect. bass was distorted, mids muddy, and highs shrill. mixes ar better on a board. I sported for a cheep 50.00 behringer eurorack to test the waters with small dirt cheep products. mixing the board and mics with that and in-putting into the ua-5. after many more uses i found the dirt cheep behringer sounded better than the ua-5 much more open sounding... good to know since i paid a sweet penny for the ua-5... now ive bought a behringer usb board and the proof is in the recordings. it transfers the sound with the same open feel. to get my portability i bought wally world converters and 12v 10 AH lead acid batteries, i can run about 5 hrs...
For what its worth