There is an updated pull request by JamiKettunen against master on the void-packages repository

https://github.com/JamiKettunen/void-packages virt-manager-sound
https://github.com/void-linux/void-packages/pull/35801

virt-manager: depend on gst-plugins-good1 for VM sound output.
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A patch file from https://github.com/void-linux/void-packages/pull/35801.patch is attached