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

https://github.com/motorto/void-packages loudagaing
https://github.com/void-linux/void-packages/pull/24400

New package: loudgain-0.6.8
Asked on #23054 

A patch file from https://github.com/void-linux/void-packages/pull/24400.patch is attached