I appreciate your hill. But several sources disagree with you.
Wikipedia: "In physics, sound is a vibration that propagates as an acoustic wave through a transmission medium such as a gas, liquid or solid."
Oxford: "1. vibrations that travel through the air or another medium and can be heard when they reach a person's or animal's ear."
Webster: "1.c: mechanical radiant energy that is transmitted by longitudinal pressure waves in a material medium (such as air) and is the objective cause of hearing"
Cambridge: "something that you can hear or that can be heard"
These don't seem to require the ear for the vibrations to be sounds in and of themselves. Only that it would be detectable by an ear if an ear were present.
Upon what do you base your assertion that it is the hearing of the thing that is the most essential requirement? (And given the thread I think it's perfectly reasonably for the answer to be something like "because it's my hill dammit!")
Same here. Tried it out and it's been great for a few months. I was just about to get some family members set up using it.