I'm not quite sure what you're referring to with "glossolalia", offhand. The shamans I work with variously use a mix of Spanish, English, and Quechua, or Shipibo-Conibo, and although all of those (if moreso the indigenous tongues) have what seem to be "filler words" with no specific (known) meaning, the overwhelming majority of the sounds they utter are recognizably from those languages, or whistling, or whatever.