sorry if i'm vague, i wrote it so many times... i try to summarize.
Sonic studio 3:
Doesn't work with the 3.5 jacks. i have the classic 3 jacks 5.1 system. With "doesn't work" i mean that whatever settings i change, it does complitly nothing.
Does work with hdmi output on the screens.
Does work with with digital headset output. Don't have a digital 5.1 sound system to connect to it to try if it works.
realtek audio consol:
Every option that you see in the screen does absolutly nothing.
I can change between the output tipes.

the amplify lvl works, but i can put it only on extreme, if i lower it the output is too quiet...

i can turn off the sonic studio 3, but ... it does and doesn't do somthing....

if i press the speakers to test the audio comes out correctly.

In the DTS sound unbound, the 5.1 video demo the you find in the DTS Headfone:X setting does play correctly on all the 5.1 speakers. but only the demo video tha you fin there.

when i try to change the Spatial audio under the windows setting do DTS headfone:X the sistem changes to stereo. And nothing like befor.

i tried to change the settings here too, but like before.

the only thing that i can do here is change the audio output volume.

i know that some SW doesn't support the 5.1 surround system.
when i watch a movie with VLC the 5.1 works a bit, but the outputs of the centra speaker and the rear are wrong. some sounds are completly cut out, when i put in stereo then i can hear what is missing. tryed to change some settings in sonic studio 3 while whatching a movie, but nothin. look the first three point in the post referred to sonic studio 3 and referred to the realteck audio consol.
when i play a game on gog, for example, cyberpunk 2077, the issue is like above.
whit the asus support i frashly installed my windows11, instelled their drivers, and followed their instruction step by step.
now the last mail that i recived is that i need to wait. They wrote:
"About the errors of the software "Sonic Studio", we are waiting for information from the competent department of the headquarter.
Please wait for our information.
Best regards - Asus Support"
An ipotetical solution is to buy a Logitech Z906, but ist quiet expensive at the moment. But i remain uncertain if the 5.1 works perfectly with the digital output like on my headset.
i hope that i didn't forgot something ...
thanks for trying to help me.