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

https://github.com/newbluemoon/void-packages a2jmidid
https://github.com/void-linux/void-packages/pull/15643

a2jmidid: update to 9
Tested on x86_64, works as expected.

A patch file from https://github.com/void-linux/void-packages/pull/15643.patch is attached