Having trouble finding local audio files that you can play in Audiosurf 2 on Steam Deck? This is what worked for me.
 

Intro

If you're anything like me, Audiosurf was one of the most exciting games on the Steam Deck. You finally find music in the music directory on desktop mode. What's the problem? Audiosurf 2 cannot find it. It is not found in the directories you search. There are also Windows directories. How can you fix this?
 
 
 

Explanation

According to my understanding, the current build on Steam Deck is not the native Linux version. It is the Windows build that runs a compatibility layer. Audiosurf 2 also thinks it is running on a Windows computer, which leads to Windows directories appearing when you try to point at your files. Audiosurf 2 cannot see the actual directory where your music is located. However, if we can point to a real music directory instead of the fake one, it should work.
 
 
 

The Solution

This guise assumes that you are using default music directory to store your songs
 
 
To make Audiosurf 2 recognize our music, you first need to switch to Desktop mode. To make Audiosurf 2 see your music, you will need to enter 2 commands into the terminal (Konsole default).
 
 
Type I:
 
 
rmdir /home/$USER/.steam/steam/steamapps/compatdata/235800/pfx/drive_c/users/steamuser/Music
 
 
Hit enter
 
Then:
 
 
ln -s $(realpath ~/Music) /home/$USER/.steam/steam/steamapps/compatdata/235800/pfx/drive_c/users/steamuser/
 
 
And hit enter!
 
 

 
 
That's it! You're done! Your music should appear under "my music". Before scanning for your music, please check this directory.
 
 
 

Notes

Basachi, a user, modified this solution to match the one on proton DB
 
 

 
 
Both steps require that the Steam ID for Audiosurf 2 (235800) be entered into the terminal.
 
The same solution should also work for other games that want to access "my" music, provided you change the number to the Steam DB ID.
 
 
This guide is intended for Linux users who are not using a Steam Deck. However, I am inexperienced with Linux so your mileage may vary.
 
 
You could theoretically modify the second instruction to point to your preferred directory if you keep your music in another directory.
 
Again, my mileage may vary as I'm still learning.
 
 
 

Acknowledgements

The Proton Database where a user posted a fix to the original Audiosurf, which I modified for this guide.
 
https://www.protondb.com/app/12900 – [protondb.com]
 
 
 
My friends Josh and Lun-4 who helped me to figure things out while I learned Linux with the deck

 
 

 
 
This is all about Audiosurf 2 – Local audio file troubleshooting; I hope you enjoy reading the Guide! If you feel like we should add more information or we forget/mistake, please let us know via commenting below, and thanks! See you soon!