@mitu Updated today with latest RetroPie Setup and OS update, and the sound is back. Not sure what changed but something was adressed in audio recently.
Maybe it just affected me but if there's someone else with similar problems, it might be good to know.
The issue with the window not scaling properly is a quirk of the pi 4 and the fkms driver. I have run into this same issue with dosbox and other emulators.
No, it's not and I would appreciate if you would stop saying that.