marqs
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Is the HDMI source outputting LPCM 2.0 48kHz? In case it’s not visible/selectable, you can try selecting EDID for Pro that indicates support for nothing else.
It’s a bit hard to follow what has been tried out, but you shouldn’t need any extra HW if you own Extra AV out card. That however assumes your HDMI consoles output LCPM 2.0ch output. In some cases it cannot be set manually but you need to select “2ch audio” EDID preset under AV4 video in opt.
There is now plan to include support for simulataneous RGBS output via VGA as apparently there is interest for such.
Does the capture card properly support 55Hz sources and is capture framerate adjusted accordingly?
You should first try adjusting Sync options -> Analog sync Vth.
The DFP presets are fully customizable incl. resolution and aspect. You just need to know exact timings for 1440×900@60 since it’s not a standard VESA mode.
When populated with optional parts, it additionally supports cvbs and s-video. VGA should not be connected simultaneously, however, to avoid double termination. PAL50, PAL60 and NTSC support has been verified with both interlace and non-interlace modes.

The product page doesn’t have much detail on how incoming sync is buffered and converted to HV (?) sync for VGA output. You can try adjusting “Sync opt -> TTL Hsync Vth” with RGBHV source, but without more details it’s hard to say what could be wrong if no sync is reported at all.
April 19, 2026 at 11:47 AM in reply to: OSSC Pro Expansion out to Hydra Scart – No stable image #69215It sounds like the switch does not like pure composite sync for whatever reason. I’m here assuming its sync input includes 75ohm termination, otherwise the signal level may be too high for the receiving logic.
Are you sure it’s supposed to output RGB sync-on-green as the video shows this input selected?
April 16, 2026 at 11:52 PM in reply to: OSSC Pro Expansion out to Hydra Scart – No stable image #69198Perhaps Hydra’s autodetection relies on status voltage on pin 8 which may not be wired in the VGA-scart cable. You could test manually selecting the input on the switch if such is supported.
You might want to wait for a few weeks as there is new prototype Extra AV Out card in making.
Have you tried if the SCART output has similar issues?
What MVS model do you have and which Supergun is used?
Maybe HDFury3 does not support the CRT modes which have high horizontal rate.
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