An mpv script that allows switching between playing one or two audio tracks simultaneously upon file load or with a hotkey.
Note that the file must have exactly two audio tracks for this script to activate, otherwise the file will be ignored.
This script overrides user defined lavfi-complex behavior.
To set a keybind, add {key} script-message switch-both-audio line to your input.conf e.g:
n script-message switch-both-audio
To switch the default state to "on" upon opening a file, create switch_both_audio.conf file in portable_config/script-opts directory
and add enabled_on_start=yes line to it.