Audio out of sync is related to NON OEM audio codec drivers. Issues like this go back to windows 98 and earlier. Sometimes instead of delay its too fast and becomes chipmunks.
Generic Drivers are replacing Analog Devices, Realtek, etc sound codec drivers rather than the specific OEM driver for sound. In your case its the Realtek driver. You should uninstall the driver, reboot, then reinstall the driver and reboot.
|Realtek Audio Driver|
This package provides the driver for the Realtek Audio and is supported on Alienware/XPS running the following Windows operating systems: Windows 10 64-bit.More details
A while back, I bumped the thread with their names (the Alienware Reps) ... that usually works.
Do you have a USB Headset (they all have their own built-in "sound-card" and their own drivers) to try?
It seems to me, that would aid in trouble-shooting.
i do have a pretty decent headset, but honestly i only use it to play games with other people, otherwise i dont use it because it makes my head sweaty and hurt. thats is more of a workaround than fix, i would really like to be able to fix the problem.... i cant believe this is such an issue, and if it is, more people aren't complaining about it, or there hasn't been some sort of update or fix to take care of it..
i do have a pretty decent headset,
When you use the USB-Headset is there audio lag? Is the problem avoided?