Postby mederi » 13 May 2014 12:50
Tools > Preferences > Show settings = All > Audio \ Output modules \ DirectX: Speaker configuration [Mono]
Save changes, restart VLC.
Then there is audio filter:
Tools > Preferences > Show settings = All > Audio \ Filters: [v] Audio filter for stereo to mono conversion
Tools > Preferences > Show settings = All > Audio \ Filters \ Mono