I have to say now I’m silly because maybe I still didn’t understand correctly. My bad 
If I understand right, this way might be one example to try to add voice: a voice maker downloads those samples, replaces samples by own new samples (keeping filenames?) and sends them to OSM Scout developer. A developer possibly can add samples to collection. I give up if I’m still clueless. I admit I want so much to help developers and other Finnish SF os users that I want really try to do something. At least I have participated in the translation work at the moment and of course voice isn’t precondition to use this application.