Instructions suffer from inaccuracies.
"2. Press MODE button until USB REC shown on the LCD and you will hear the voice prompt Recording Mode, at this time, start recording automatically to USB."
There is no "voice prompt" and recording does not start automatically. You must press play/pause button to start recording.
My only use is to record an AUX out from another audio mixer via balanced XLR to USB and this seems to work fine. I have not used other functions, so I cannot attest to their function and / or reliability.