I'm not stupid, it doesnt explain how to add recordings in to an old mesh only how to create new ones, sigh
If you just learned to search, then you woundn't have made this thead...
http://www.buddyforum.de/forumdisplay.php?31-Gatherbuddy-Guides
Just load the mesh you want to add to ("Load Mesh" Button), then press "Start Mapping" when you're at the gy, run to your corpse, and Stop Mapping. That should link the GY to your current mesh.