Z390 TAICHI soundtrack problem

I just bought new asrock Z390 TAICHI + I7 9700k. After i installed fresh win10 64 just noticed there is something wrong with sound like low noise high tone squaek. Speakers plugged to lime jack. Temps are ok. Everything butter smooth exept soundcard. You can even hear this after you boot PC like afer bios post. At desktop you can hear even more white moving mouse. I did some reserch and IT looks like im not alone... Anyone can help?

I'm having a similar/same problem. I notice that if I plug my Logitech speakers in the the rear "Speaker Out" port (and then I plug my headphones into my speakers) that I can hear some type noise and/or interference - and the sound level can be increased when turning up the volume. This sound exists whether or not I am playing music or gaming. This sound also exists if I plug my headphones directly into the back port. I've also tried plugging into the other various sound ports, and the noise also exits.

This is very disappointing and I would probably RMA it if 1) it wasn't such a hassle to rebuild my entire computer and 2) if I thought the problem would be fixed with a new board.

Is this a problem that cannot be fixed? If so, I'd at lease like Asrock to acknowledge it.