Can you provide more information? Under what conditions or triggers does this happen?

Is hearing something coinciding with other senses? For example, are you hearing this while touching something? Hearing this when you see a particular colour?

I ask because what comes to mind is synethesia it is a condition whereby an individual has more than one sensory response. For example, some people 'hear' tastes. Some people might 'hear' color. Some people might 'see' sounds. I have a friend who 'sees' taste. For him, taste has colour. He says it as though he were looking through coloured glasses when he eats.

Does any of this sound familiar?