Headphone audio not working

Audio was only going to the internal speakers, even though all other sounds were going to my headphones.

I found this link with instructions on how to set the audio device directly. The paths on the Deck are somewhat different, and I don't have it in front of me, but you can find the files by opening your file explorer, showing hidden files, navigating into the .steam folder, then searching from there for FMODDriver.

I tried following the directions to look in DebugLog.txt but the file remained empty. FMODDriver.txt simply had a 0 in it. As a guess, I tried changing the 0 to 1 and restarted the game, and the audio now goes to the headphones!

Non-native game with Proton launches and headphone audio works, but it crashes when attempting to reset progress on a save slot, so there's a chance it would also crash when starting a brand new game.