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At this point, I would think it’s one of two issues. Either the HDMI->VGA adapter doesn’t like being fed 15kHz signals, or the RT2X somehow introduces audio noise when passing-through 15kHz modes.
Testing passthrough solely on the RT2X might be a little difficult if you’re connecting directly to a TV that doesn’t support 240p/480i over HDMI; however, if you have an AVR, that should still play audio, even if your TV can’t display the video mode.
One way you could test the HDMI->VGA adapter:
1. Connect composite output from the console to green/Y of AV2 on the OSSC;
2. Connect HDMI output of OSSC to the HDMI input on the converter;
3. Connect the 3.5mm TRS output from the converter to an AVR, speaker system, or plug in headphones;
4. Turn on everything;
5. On the OSSC, configure 240p and 480i for passthrough and set input to AV2-YPbPr.
If you still get audio noise then, I’d blame the HDMI->VGA converter.