Sometimes installing directx isn't enough as it may not overwrite certain files in certain circumstances. I'd use this .bat to strip out the directx - (make sure to rightclick, run as admin) https://drive.google.com/file/d/1rJvafaYjKDOZia5IBMeeIOU5sVZPfzKW/view (if you are curious what it does - just rightclick it, and edit it in notepad to see).
- then reinstall directx from steam/steamapps/steamworks shared/_commonredist/directx/jun2010/dxsetup - or download MS's directx websetup - https://www.microsoft.com/en-us/download/details.aspx?id=35. Make sure to rightclick it and run as admin.

*'Newer' directx - https://www.microsoft.com/en-ie/download/details.aspx?id=8109

You can also edit the .bat and look at it if you want to be sure it isn't doing anything funny. The pause is there so you can scroll back and look for errors (I think it shows all). If it worked correctly, you should end up with 2 folders with 90 files in each. Sometimes steam(other progs may too) holds open .dlls and they won't move. You'd need to close those apps and try again, or restart/clean restart pc and try again). (in a few circumstances, you may even have issues reinstalling directx if it complains about newer versions/etc - which requires extra steps sometimes - meh)

Then if you still have issues - I'd check if spatial audio is off in windows - as it is known to cause problems for some - can even try toggling on and off. I'd also look into uninstalling/reinstalling your audio drivers (not using whatever windows uses, but the manufacturer drivers (or test windows ones /shrug).

Then everything else (which you shoulda/woulda/coulda checked first) - like uninstalling and reinstalling all audio device drivers, check devices used for sound ingame, if you are using bluetooth stuff you may need to turn it on after gtav starts. Check what devices are set to be used ingame (and out of game -.-) - it could be set to something you have enabled/volumelow/external/internal/not plugged into/etc. Test different audio/headset, voice chat off ingame incase it is muting audio. Be methodical and rule things out. There may be some other things that are causing it (except they usually result in no sound period) - but in the majority of the instances I've had to look at these first hand - the above covered it.

Multiple audio devices have caused on/off issues for years. If possible you can disable various ones in device manager to test. Some users also disable BOTH input AND outputs of the devices with some success, usually related to telephony/voice related issues/headsets/mics. There have also been people that have put the pc to sleep, and not completely restarted it - particularly with the game at main menu IIRC - that have had issues. In some cases - all you need is a solid pc shut down/restart.

*edit - if you've screwed around with media feature pack files and manually added them to the gtav folder, or replaced some in system32 (/facepalm) - they should also be removed and correctly install the media feature pack - if you actually need it (are on a N/KN version of windows). Wrong versions of some of those have also killed audio in the past.

To clean the gtav root folder of mods/files you've thrown in there- enable file extensions - delete ANYTHING that is NOT a .rpf file AND is NOT a folder. Verify cache.

*similar thread/info - related to audio missing ONLY in gta online -
https://psteamcommunity.yuanyoumao.com/app/271590/discussions/0/3315233099213159762/#c3315233099214755900


Original link -
https://psteamcommunity.yuanyoumao.com/app/271590/discussions/0/1746765743927084651/#c1746765743927107223