Matt,
Thanks I verifed this issue and you are right. Really dissappointed that I didn’t do a better job of research. But who of believed that Matrox would make such a flawed design.
Anyway I have good work around. I just load my Beta deck with a blank tape and let it play. My DAT is deck controlled via Adobe Capture screen so I can log, realtime capture etc. I set the Video/Audio capture setting on the screen for audio only and turn off the Beta sound output at the mixer. Instead I feed the DAT audio to monitors. Painful but at the end all captured was the audio, no video was captured. Can’t thankyou enough. Next stop email to Matrox