Hi Diki,
I think those are some custom samples.
Yamaha Germany released some Gregorian Chants samples within their SFX Kit a while back, which I put on my Multipads for Enigma type of Music. Pretty cool feature.
Eric
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Genos, PSR-S970, TC Helicon VoiceLive3, Mackie 802-VLZ3 Mixer, 2 Bose L1 Pro16, Electro-Voice ZXA1 Subwoofer