The audio on the Amiga side only appears to be working when I set it to "Rear Audio Socket" - the 3.5mm audio jack on the unit itself. When I set it to HDMI Audio, I get audio in the main menu, but not when I start a game/app/Amibench - that starts in complete silence. Sound on the Amiga side will only work through the audio socket. Is this a current bug/"undocumented feature", and if so, is it being worked on to work with HDMI?
That's an odd one, if the sound is working in HDMI for the main menu it ought to be doing the same in the amiga side.
Could you check if any audio is coming out of the audio jack, when the main menu is set to HDMI and you start a game? Could be they have got out of sync somehow, but I've never seen that happen.