There is a new pull request by ScrelliCopter against master on the void-packages repository

https://github.com/ScrelliCopter/void-packages mumble-jack
https://github.com/void-linux/void-packages/pull/20840

mumble: enable JackAudio support
Avoids issues with the ALSA backend on my setup.

A patch file from https://github.com/void-linux/void-packages/pull/20840.patch is attached