So I just got GOG so I'm new to this platform. How do I fix the problem with the audio? Also, is there a 1920x1080 fix?

Thank you!

Just fixed mine and I'm very happy!
I've downloaded the game via GoG Galaxy
<ul>
<li>During install I've created a desktop shortcut</li>
<li>Right click on the desktop shortcut => Properties => in General - Destination I've added -nointro after the game path (now it's "...\Swat4.exe" -nointro)</li>
</ul>
Now the game skips the intro video and credits, and sound works perfectly! Hope this could help :)