[Karim Zouak] “Machine control is via a USB to RS-422 convertor, which appears to be working well enough in that the deck responds to commands. I’m running the image out via firewire to an AJA I/O Pro box”
Your Io has an RS-422 port, why not use that for deck control? If that still doesn’t work, then look into replacing the synch generator.
Arnie
https://www.arniepix.com