I am writing something in Latin in which I need to use a few technical terms that relate to sound. I have searched a neo-Latin dictionary without success. Specifically, terms I'm looking for are "frequency, high- or low-frequency, high- or low-pitch, audio recording [incisio ____?], sonar [think I'll have to make up a circumlocution for this one], Hertz [I know this is a name, and so it will probably stay the same, but in Latin, I want to write "a sound of 30 Hertz/sonus quinquaginta Hertz" and not "a 30 Hertz sound" like in English, and with Hertz just being a name, it confounds me.]." More general question, are things that lack vocal cords said to have "voces?" Do animals generally have "voces?" How would say an animal's call? In this instance, a whale's? I think "cantus" is will be appropriate in some instances like our "whale song" in English but maybe not all. TIA.