Whether their capacity scales up to full-size human capabilities is still an empirical question. The means is in my head, but the data on which it operates is the handwriting sample. It can only be supported by positive examples of intertranslatability, or challenged by alleged examples of untranslatability. If I understand it, I will translate it into any language I know. Please do me a favor.
Interpretation is more at home in literary criticism or theological analysis.
The natural languages are all intertranslatable, but not translatable into music, because music is not an all-purpose symbolic code that can express propositions. The tonal system is an acoustic system that brings pleasure to the ear, and musical notation is a why of encoding its acoustical parameters in frequency and time. We are certainly specially adapted to pay attention to speech. But our early affinity to music is quite remarkable too. I'm not sure what you asked here.