I can add support for having voice pack files in alt directories. I would put it behind a define since it’s a feature that most people probably don’t need, but it wouldn’t be particularly hard to do.
I might even be able to speed things up a bit. Right now it looks in each directory in your font path to find the sound files, but I could make it so that it just looks at where mnum is and expects the rest of the files to be in the same directory instead.