Audio issues, high pitch screetch during focus.

I am currently using Hyper X Cloud II headphones, which use a 1 - 2 splitter to be able to use both microphone and headset with my PC. A high pitch noise is heard during BeamNG.Drive, but only on focus. It also happens regardless of volume, both of Windows itself, the Beam window, and the ingame master volume. This also happens on other games (Cities:Skylines, Operation Harsh Doorstop), but each one is different. I have tried the following:

• Not using the splitter
• Plugging the headset into my monitor
• Changing nearly every setting in control panel
• Emailing HyperX

I have no clue the origination of the problem, and any help would be appreciated. (sorry if this is in the wrong category)