This Pentocostal mumbling is just nonsense. Meaningless jabbering.

Real speaking in tongues is what occurred with Saint Vincent Ferrer in his European Tour back at the time of the Avagnon Popes. Vincent Ferrer was from Castile Spain and only spoke Castilean Spanish. He was the most powerful Saint in History, many more miracles a day then Christ had performed in a Life Time, and so he was immensely popular and attracted huge crowds. And there were no speaker systems back then in the 13th Century. However, in these large overflowing crowds of hundreds of thousands of people, each person would hear Vincent Ferrer speaking from the stage, sometimes almost a mile away, and they would hear him in their own language.

so you see, 'Speaking in tongues' is more intended to mean closer to the idea of "Hearing in tonques'' -- there must be some understanding. Incoherent jabbering by Protestant Rebels still with Catholic Blood on their hands is more to be considered as manifestations of Satanic Devilry.