Hello @RikVB ,
I’m not sure if this works for the Pro V3 (I have an A50+), but you can try the UART commands (via TCP passthrough) available on this page: API Files for Developers
MCU+PAS+RAKOIT:ASW:1& to enable automatically switching back to previous source,
MCU+PAS+RAKOIT:POM:LINE-IN& to set power on mode to line-in.
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