OK, one more bit of information. I updated my OSSC to the latest firmware and immediately had audio. However, I’ve found that I only have audio on V2 when I’m in Line2x mode. In Line3x mode I get completely stable picture in any of the generic or optimal modes but no audio. In contrast my SCART input is able to play audio with any lineXX combination that my TV displays picture on (I am going through an AV Receiver though).
The only different between V1-SCART and V2-Component? V1-SCART is a Genesis and V2-Component is a SNES.
Could this indicate a sync jitter issue even though I have completely stable video?