i use bazzite and this worked for me its how to do it on steam deck but it still works. if you have plutonium added to steam as a non steam game do it to that
Go to desktop mode and into the discovery store. Search for protontricks and download it. Open it and select black ops 1. Then select the option for installing a windows component. Choose to use the default wine prefix. Then you will see a huge list of files. Scroll all the way down until you find one called xact. Select it and download it. The app will close temporarily until it finishes downloading this file. You will know that the file is done downloading if the app opens up again That's it. Now you should be able to hear the audio.
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