Am now 100% sure it’s interface that is screwing my default playback device.
When i start interface the playback device where set like this.
Now, when i used Interface.exe and i log out. I lose my audio.
I now know that interface is not restoring the playback device.
With that windows is staying in this setting that is complete wrong.
And this is lucky without running steamVR. That would make things only more complex. SteamVR or steam you only start when you need VR. after that you turn it off. I use the desktop version of high fidelity, for the simple reason that the steam version is always starting steam , also when you not need it. On top of that STeamVR can be extra drama with your audio settings.
It start to get boring, and sometimes you forget it to figure everytime out where my audio is and soemtimes you need to restart application to get it back after correcting playback device.
Required fix, remember the playback settings when you start interface and restore them when you close interface.
UPDATE: The header description where wrong.
ADD: The thing get stranger, because interface is set to use the same device for output as windows use as default playback device. And interface still thinks it need to change the default playback device inm window to a wrong settings.
I btw need to figure out why windwos is seeing 3 optical devices as playback.
Something changed in build 6358 ? Now the default device seems to stay. Not sure for how long.