Basically OSSC only does component or RGB input so if you want s-video and/or composite then you'd have to use a retrotink2x (it also has component input) either alone or using it to feed the OSSC.I've got a couple CRTs and I think it's allllllmost time, in 2019, to move on. I've used Analogue consoles and I love them.
I'm interested in an OSSC, but I use some consoles with S-Video and even composite, and I don't want to modify these consoles to output RGB. Is there some convenient and lagless hardware I can throw into the chain there to fix this? Or am I mistaken in assuming that OSSC only supports RGB?