Ethnic can mean different things. Any specific content you're looking for (certain region)? Or are you looking for a broad collection of material that covers all of the various locales including (but not limited to):
Drone (ethnic or spiritual music which contains drones and is rhythmically still or very slow)
North America (native American)
Hi, for Motif Xs there was this free sound bank from Yamaha :
This bank contains some voices free bank from Digital Sound Factory WorldXSpedition and new Yamaha sounds .
A partial list of sounds. Thumb Piano, Mbira, Waterphone, Oud, panpipes, bottle, Venu, Domura, 2 different sitar, berimbau, Marimba, Vibraphone, Talking drim, Drum Pot, balafon, Dulcimer, Latin percussion, Indian and world, including sounds Tabla, Djembe, Darfil, Dholok ......
226 waveforms, 140 MB, 816 Keybanks, 128 voices in user1 A01 to H16, 6 drum kits User B11 to B16, file type All Motif XS format.