Both the speaking and the hearing were supernatural. There is no natural understanding to tongues.
Well this right here is your whole problem in misunderstanding.
I have repeatedly given you the Greek meaning of tongues. When you read the context of Acts 2 (and yes, of course 1 Cor 14 in in mind too), it literally means that the disciples received the ability to speak another language they have not known before. Gift of tongues. This by no means demands that the receiver must have a gift. Thats where your problem is.
Lets simplify:
Peter's native tongue/language is Galilean
However, he is in Jerusalem, a major trade hub of that time. There are MANY tongues/languages walking about there.
Remember in the OT the Jews from the Northern kingdom were scattered before Judah was. What this means, is that from the time they were scattered and displaced in the OT till Peter came in Acts 2 to preach with the others, the Jews who traveled back to Jerusalem for whatever reason spoke other tongues/languages.
6 Now when this was noised abroad, the multitude came together, and were confounded, because that
every man heard[the Jews heard]
them speak[disciples spoke]
in his own language [Jews heard their native tongue/language that they were born with from the disciples].
This is where those Jews were from and therefore natives of, since the scattering in the OT by Assyria and Babylon:
9 Parthians, and Medes, and Elamites, and the dwellers in Mesopotamia, and in Judaea, and Cappadocia, in Pontus, and Asia,
10 Phrygia, and Pamphylia, in Egypt, and in the parts of Libya about Cyrene, and strangers of Rome, Jews and proselytes,
11 Cretes and Arabians,....
Jews from these areas, were natives of those areas, spoke the tongue/languages of those areas
11 ...
we do hear them speak[Jews heard the disciples]
in our tongues[disciples spoke the native tongue/language of those people who were native to those areas] the wonderful works of God.
Lets say Peter who spoke Galilean but not Parthian, received the gift of tongues to speak the tongue of Parthians.
Well for heaven's sake, all that means is Peter can speak Parthian now without having ever learned it himself.
Does that mean that the Parthians have to have a miraculous gift to hear their own language/tongue?
No.
8
And how hear we every man[for example: the Parthians are hearing Peter speak that language]
in our own tongue,
wherein we were born[Parthian Jews are natives of Parthian since their displacement by the Assyrians in the OT and therefore speak Parthian]?
Another example:
You speak English.
A German, who speaks German, but not English suddenly receives the gifts of tongues.
The German begins to preach in English.
Do you have to have any special gift to hear the German speaking English?
No. You already know English. But you would be amazed that the German who was not speaking English before suddenly began to.
6 Now when this was noised abroad, the multitude came together, and were confounded, because that every man heard them speak in his own language.
7 And they were all amazed and marvelled, saying one to another, Behold, are not all these which speak Galilaeans?
8 And how hear we every man in our own tongue, wherein we were born?
No. The Jews, no matter how devout, did not need any special gift to hear their own native tongue/language.
And so now my posting about 1 Cor 14 should make more sense.