Thank you, glad we seem to have got to the bottom of it.
I just have four audio output device options:
ALSA: Default (AML-MESONAUDIO, Analog), PCM
ALSA: AML-MESONAUDIO, PCM
ALSA: AML-MESONAUDIO, HDMI
PULSE: Default, Bluetooth Audio (PULSEAUDIO)
I’ll try your suggestion, but maybe just leaving the output at 2.0 and using my receiver’s Dolby Prologic II capabilities might be simplest.