Using the OpenAL-Soft project's Openal32.dll seems to help for me.

This was improved since the last release as it's finally bearable, but until the next official release you'll have to compile your own version.

That's good news! It was bothering me a lot too. The only game that didn't have any issues with sound was Doom 😜 When i played, for example, Duke Nukem 3D, every sound played twice. I will try to compile the newest version this afternoon.

How to get sound in Windows XP in PCem?