Did some more testing with my SNES and Philips TV and turns out linetriple DOES work at 50 Hz BUT only in optimised mode… Notably, 60Hz optimised is the ONLY mode where the OSSC doesn’t sync. Interesting to see if the advanced sync options in the upcoming firmware may do something about this…
SNES mode. Lx3 mode. OSSC sync. TV image. 50Hz. Generic. Yes. No. 50Hz. Optimised. Yes. Yes. 60Hz. Generic. Yes. Yes. 60Hz. Optimised. No. No.