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Hello! I've a question, how I can set the default "Stereo Mode" to Mono for all songs. I use VLC for listening to modules (.mod). When listening to a file, I can set to Mono mode, which mixes the left and right audio channel together into one ear, as it was intended. The problem is, that when the next song is played, VLC automatically switches back to Stereo! How can I make it staying with Mono audio? I'm using Linux with VLC 3.0.9.2, but I doubt it has something to do with OSes and version numbers.

Set stereo-mode in the preferences or vlcrc, not via the Audio menu.

I found it, where the stereo mode can be set in the settings. There are some options: Stereo, Stereo channels swapped, left, right, dolby sourround, headphones (translated words, may look different in the actual version). But mono is missing there.
Same for VLC 3.0.11 on Windows.

Eh. Well you have to edit vlcrc then.

Confirmed to work. Merci!

This sounds like exactly what I want to do, except I have no idea how to "edit vlrc" and I can't find out by searching for those terms here. Any more explicit advice would be welcome.

Also, it does seem like a bug, the fact that "mono" isn't listed as an option in audio preferences.

Also, though I can make the audio play OK by resetting it to mono, when I record it still comes out as a distorted stereo.

Have a look at the VLC Wiki. Under the search term "vlcrc", you'll find the page called Preferences. Here: https://wiki.videolan.org/Preferences/

Depending on your operating system, the vlcrc file is located elsewhere. For Linux, as my user name on my computer is called "Bird", it would be the path /home/bird/.config/vlc It's a hidden folder, so you probably should type it into the address bar on your Linux.

You can edit the vlcrc file with a standard text editor. Search for the line "stereo-mode". Remove the "#" in front of that line, because it would comment the line out. Maybe you've seen this in programming code. The lines with a "#" aren't used in the actual program.

Thanks to all who answered, especially Moonbird who pointed to where the file was in Linux/Ubuntu, and Rémi Denis-Courmont who provided the exact code to change. Thanks everybody. --Myk