Came up with an acronym for Ethan's four categories of audio purity.
Distortion (newly added frequencies)
frequency Response - also Ringing
Level must figure in there somewhere as well as virginity but maybe that's obvious. Might be useful for someone trying to describe how something sounds besides qualitative words like 'warm' or 'brown'. Maybe not 'brown', however; that's a legit science word. I think.