@MrStEnch Hi. Ok I tested this and exported the file as an MP4 without issue. The sound is working properly and I didn’t even do anything.
Honestly I’m not sure then what is happening, it could be that your specific video player is not being sorted out in Windows sound mixer, or perhaps it’s disabling certain video files audio.
Please try out with other video players like VLC, or Quicktime Player, or even try to drag and drop into a chrome tab and let the chrome video player play it back for you to rule out that possibility.
The other possible problem is that you’re lacking sound codecs in your computer. If you install Quicktime you’ll be more than able to playback MP4 files, or if you install a certified Windows codec package, that could work as well.
If you tried exporting an AVI and it isn’t working either…then it’s definitely a software problem with codecs and not a hardware issue. However this isn’t related to Pencil2D but rather to Windows.