What’s funny is that 0 is neutral on my TV except for resolutions like 1280×960 and things like that. In that case, it’s 50. Any lower and green lines appear and any higher then red lines appear.
In short, for 480p, 576p, 720p and 1080p, 0 is neutral
For others, it’s 50.
I tried my PC monitor and it handles 960p correcty (no surprises there). For my TV, 480p passthrough may be sufficient, not sure about 480i or 576i, maaybe 2x mode.
Also, scanlines don’t work in 480px2 for me. I just get a darkened image