A tinnitus remover or something for people who are sensitive negatively to ultrasonic.
For tinnitus remover-
tinnitus can be developed without any hearing loss or structural damage whatsoever and even when there is hearing loss or structural damage, it is a neurological issue predominantly from my understanding. Case after case of person’s shows emotional and stress response induce and reduce it. As does a cognitive understanding and re-framing of the focus of/on the sound as a threat or not. I can see this kind of thing being highly subject to subs being effective with it.
For persons who can’t use ultrasonic to be able to-I have no idea what that would entail.