-stereo parameter isn't for sound, but for 3D displays

[ThreeDeeJay]

https://gillian-guide.github.io/additional-setup/#launch-options

I see why people would think this is to set stereo speaker configuration, but it doesn't switch off surround if it was set, and according to the executable itself, it's graphics-related:

I'm still trying to find more info about it though. I still have a working NVIDIA 3D Vision setup which is what's most likely to be supported (even GTAV had a native 3D Vision mode when compatible hardware is detected) but the command doesn't seem to do anything, or improve the native/modded stereoscopic 3D support

https://gamefaqs.gamespot.com/boards/952150-grand-theft-auto-iv/54529334
https://gtaforums.com/topic/410894-new-hidden-commands-from-gta-iv/page/2/#findComment-1059643049

[SandeMC]

added to the guide but issue will remain open until there's a definite explanation of what this does