1 Cor 14:
7 Even in the case of lifeless things that make sounds, such as the pipe or harp, how will anyone know what tune is being played unless there is a distinction in the notes?
8Again, if the trumpet does not sound a clear call, who will get ready for battle?
9So it is with you. Unless you speak intelligible words with your tongue, how will anyone know what you are saying? You will just be speaking into the air.
10Undoubtedly there are all sorts of languages in the world, yet none of them is without meaning.
How difficult is it for you to understand the above?
Paul is saying that lifeless things that make meaningful sounds are better than unknown words all day.