The OSSC outputs DVI-D.
Have you tried to set TX mode to DVI?
The 2 TV sets I have (LG and Sony) turn off the analog stereo input when TX mode is set to HDMI.
What you want is an HDMI audio integrator. There is an older topic on the subject: https://videogameperfection.com/forums/topic/atlona-dvi-and-audio-to-hdmi-embedder/
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