I used to sent SMPTE via 3.5mm audio jack on my old MBP 15" before and it worked just fine,
but the new MBPR only has one 3.5 combo jack,
therefore I bought a XLR to USB adapter,
Mac recognizes it as a USB PnP Sound Device in System Preference panel.
and I also bought this device
Mac recognizes it as a C-Media USB Headphone Set in System Preference panel.
In Arena's preference panel I can also see these two devices show up in the SMPTE drop down list,
but Arena can't read the signal, I've tried Arena 4.1.8~11 get the same result.
Both devices work fine in Qlab, so I can sure they are not broken.
so is there any solution to fix it ?