RE: It’s not a leap to infer that Paul is teaching the Corinthias how to use angelic tongues, since he clearly states that absent an interpreter, no one is edified in their minds.
OK, let’s accept this then. Since there are interpreters, then humans should be able to learn this angelic language.
Also, it can be inferred that those speaking it do not know what they are saying because if they did, they would be able to interpret what they said themselves ( I am multi-lingual by the way and I can interpret myself when I speak in Chinese, Filipino or English ).
It can also be inferred that those who can interpret KNOW the angelic language. And if so, it can be inferred that there is a GRAMMAR associated with it that we can learn like linguists do.
The question then becomes — absent an interpreter, how do we differentiate between someone who is simply babbling and someone who is speaking in a heavenly language which can be made intelligible to others?
I have no clue.
I have heard people who were "speaking in tongues" that sounded like nothing more than ticka-ticka-ticka-.........
That does not seem to resemble in any way what happened in Acts 2.
The Scriptures neither teach nor suggest the possibility of learning angelic languages. The gift of tongues, given by the Holy Spirit, is utterance. I.e.: He imbues the gift of giving utterance to this angelic language, and Paul says that the gift of interpretation should be sought through prayer.
If the prayer is answered, the interpretation would be like the tongue: a gift. Again, there’s no indication that this gift would amount to a lesson in angelic grammar [do we even know that our minds could grasp the equivalent of angelic grammar—providing there is one?]. It would be the gift of knowing the meaning of the particular utterances in question.
My advice is to assume the tongue is real. The New Testament mentions nothing about fake tongues, for one thing. For another, the penalty for witnessing a manifestation of the Holy Spirit’s power and failing to give Him the glory is eternally dire. It’s a risk none of us should willingly undertake.