A few questions about the Pico 4 Ultra helmet and its correct operation with the Elite Dangerous game in VR mode.

There was a problem with the Pico 4 Ultra helmet and with the Elite Dangerous game.
The helmet is configured normally. The firmware is global 5.12.0. The VR mode in the helmet works fine. SteamVR is also used. Virtual Desktop is not installed and is not used at all.
Just a week ago, the Elite Dangerous game was configured to run over a USB cable and use it in a helmet. I struggled with the settings. But I managed to ensure that in VR mode the game uses sound output not from computer speakers, but directly from the helmet. That is, when the computer does not use a USB connection to the helmet (the helmet is not active), the sound is output through the computer speakers, but when the helmet is connected and the game starts, the sound begins to output through the helmet. I did this in the settings of the Audio bookmark in SteamVR. There I chose not "Helmet", but "Manual setting" and audio output to the Pico device.
However, a couple of days ago, something strange happened and the audio output settings in the helmet stopped working. Now, when starting the game, the sound is output simultaneously in the helmet and on the computer. When I "Manually select" the audio output to the Pico device in the SteamVR settings, the sound disappears everywhere. It is not displayed either in the helmet or in the speakers on the computer! That is, the sound only works either simultaneously in both devices, or only in the speakers on the computer. You can't turn on the work only with the Pico helmet, as it was a week ago. I've tried everything. But without success.
In the Windows 11 operating system, all devices are present in the audio output devices – both computer speakers and Pico speakers. But for some reason, in the properties of these devices, I can select the default one – only the computer speakers can be used. Pico speakers – cannot be selected, because there is no such item in the properties of Pico speakers at all – assign this device as the default output.
How can I force SteamVR to output sound only in Pico 4 Ultra when starting the game (and Elite Dangerous starts in VR mode only when using SteamVR)?
Thank you in advance!
 
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