Geoff when you were instructing with "oscillating or vibrating" memos saying that the audio signal is not either but sighting an alternating current. You do realize that AC is measured in oscillations don't you? In fact in electrical engineering you are taught that AC is vibratory current.
BTW audionuttoo "Certified Professional Engineer and Class A Master Electrician" is pretty high up on the food chain of engineers.
Sometimes I get a little kick out of you and kosst, as you both try to marginalize our teaching here at the tune without knowing our collective schooling. It's kind of a joke amongst us when we talk about "audiophile experts". We usually find that the audio internet EE's who boast the most actually have the fewest courses under their belts in reality, or the most dated.
MG