XCP not able to forward sound card?

Question

Xen

There is a home machine (mother - Asus P8Q77-M, stone xeon E3-1225, RAM 24G)
On which XCP is raised and several virtual machines work. A video card was thrown into the virtual machine with Win 7 (GTX 680, modified for Grid K2).
In short, if a video card is forwarded to the virtual machine, and a usb controller and a sound card are additionally forwarded, then only the video card and usb work, and if you turn off the forwarding of the video card, the usb controller and sound card work.
The card is forwarded as vgpu_pci => there is also an additional sound device on it (it was never defined in the virtual machine at all), if forwarded as pci, then it doesn’t work either.
During the setup, there was a moment when all three devices worked at the same time, but after a reboot, happiness ended)
Bios latest
XCP 1.6.10 16809c
PS The sound is still working through the crutch sound -> virtual sound card-> soundware server -> ethernet -> router -> wifi -> phone -> soundware client -> audio system -> sound. In principle, this is enough, but I would like to get rid of this crutch.
Thank you for your attention.