(1) The premise is false since you cannot see a red cube without that there is something, a real thing, that is the bearer of the visual features that usually a red cube has. When it seems to you that you are seeing a red cube without that there actually is a red cube, it is because you are hallucinating it: there is nothing that instantiates the visual features of a real red cube. Can we apply the same reasoning to audition in order to claim that the premise is false concerning auditory appeara