[Eliot173]

Ok. I called AJA and they said I need a video signal going into the ProIO even if I’m only capturing Audio. Silly me. Crisis averted. In case this is any help to someone else, I’m capturing sound from DAT via XLR, controlling the deck with Serial (RS-422), and sending a video signal from Betacam to Component In on the ProIO. Good luck! AJA’s phone support is great.