Stop the press! I’ve been using Linux for ten years now and had many a problem. When I got the solution I always understood why the solution worked. This time, however, I don’t get why the following works:

1. Goto the Retropie config screen in EmulationStation
2. Choose ‘configure audio’
3. In the dialog script/screen choose ‘Auto’ (as opposed to HDMI or headphones etc.).
4. Sound works.

Maybe one day I’ll find where this shell script is on the SD card and then I’ll kmow why it works and Alsa settings don’t… :-)

[edit] Oops. Sound works via command line except in ‘colem’ (the Colecovision emu that runs games at the right speed).