Hi djp,
The process explained by danand works well, but may be tedious when merging many voices from different PPF files. The idea I propose, is to merge the whole packs (without selecting voices) and remove unwanted voices afterwards, so you don't have to export all these additional packs containing the selected voices. The process uses six easy steps:
1 - In the top area of YEM (the one called "My Packs"), select "+" then "Create Pack". A new pack icon (called "Pack 001" if it is the first one you've created) should appear in the pack list
2 - Click on this "Pack 001" icon, and change its name. Note that its (empty) content appears in the bottom area.
3 - In the bottom area, select "+" then "Import Content". A file selecting popup window should appear on the screen
4 - Hold the Ctrl key down and click on all the PPF files containing the voices you want to merge. Click on the "Open" button to import the content for all selected packs (it may take some time...)
5 - Hold the Ctrl key down and click on all the voices you DON'T want to keep. Press the "Delete" key on your keyboard and confirm by clicking on the "Delete" button
6 - In the "My Packs" area, select ">" then "Export pack" to generate your merged voice pack... DONE !
Regards,
scirocco