@Ding an Sich,
(On the epistemic problem)
...let me play around as a devil´s advocate for a second...
...can the concept "vibrations" ever refer to the vibrations themselves ? Are you not repeating the same mistake with the term "vibrations" instead of sound, but only in a more elaborate way ? A thing does not refer by instantiation alone, no matter how hard we want it to do so...in fact reference is always symbolic, since what is, only itself alone fully instantiates its own beingness...more, a description even if fully reproducing a phenomena, like in information theory, is not the phenomena X but the reproduction of the phenomena X...therefore its X1 ! Logic dictates X1 is not X !...