pacmd load-module module-remap-sink sink_name=right-channel master=${MASTER_CARD} channels=1 master_channel_map=front-right channel_map=front-right
pacmd load-module module-remap-sink sink_name=left-channel master=${MASTER_CARD} channels=1 master_channel_map=front-left channel_map=front-left
Вот здесь ответ https://wiki.archlinux.org/title/PulseAudio/Exampl...
А здесь диссукссия на эту тему - https://wiki.archlinux.org/title/Talk:PulseAudio/E...