A friend of mine lend me some of his equipment yesterday, I just wanted to give a small update.
PSone with different RGB cable-> same result
GameCube with an RGB cable-> worked fine, so the OSSC doesn’t seem to be defective
Connecting my PSone via a Framemeister-> same problem as the ossc with default settings (sound without picture), but increasing the sync level to around 25 fixed all issues.
I get a perfectly stable image with these settings and the video output of my PSone seems to be ok according to the framemeister (59.82hz)
I wonder if this affects all PSone units with the OSSC or if it’s just mine, but I guess I just have to use something different for this console.