So when Paul was speaking of those who had a prophecy taking turns, he was speaking of people in the Church that spoke a different language of the world, which required an interpreter so the rest in the Church could understand what was being spoken. And in those chapters the idea of prophesying is about teaching, not speaking in some unknown gibberish.
1 Cor 14:7-11
7 And even things without life giving sound, whether pipe or harp, except they give a distinction in the sounds, how shall it be known what is piped or harped?
8 For if the trumpet give an uncertain sound, who shall prepare himself to the battle?
9 So likewise ye, except ye utter by the tongue words easy to be understood, how shall it be known what is spoken? for ye shall speak into the air.
10 There are, it may be, so many kinds of voices in the world, and none of them is without signification.
11 Therefore if I know not the meaning of the voice, I shall be unto him that speaketh a barbarian, and he that speaketh shall be a barbarian unto me.
KJV