Hi Tony,
What file sizes do these UVN Voice files have?
If they are only a few KB (kilobytes) in size, they do not contain their own samples (but only use the samples from Tyros3/4 Preset Voices). Such UVN files may not work with YEM compatible models.
In contrast, UVN files, which are several/many MB (megabytes) in size, contain their own samples and should work with the Genos if they are correctly imported into the YEM and then installed on the instrument.
You can import UVN files into the YEM with “Import Content” (into a new, empty pack or into an existing, non-protected pack). If you have an associated UVI Library file, you can also import it with “Import Pack”. This will create a new pack containing the UVN Voices linked in the UVI Library file. It is important that the UVI file is in the same folder as the associated UVN files.
Hope this helps!
Best regards,
Chris