> Tried to upload my favorite recorded audio file (MP3) from Japanese program given in the middle of 1980s about a ancient mound (grave) in Japan. A Japanese famous archaeologist, late Koichi Mori (a professor of Doshisya University at that time) talks about Hashihaka mound, but he talks in ... in Spanish?

I'm not sure I understand what you're saying. Do you mean that the talk was in Japanese but the output of this service somehow screwed it up in a way that it sounds like spanish?

Or are you just mentioning that the thing you uploaded was spanish and not describing the quality of the output?

I uploaded a sound file the professor talks in Japanese, and the enhanced file can be listen like a speech in Spanish.