If you're taking trazodone for sleep, that caused a lot of auditory hallucinations for me.

It could be that the seroquel was masking an underlying psychotic process that had been festering.

Are you on Wellbutrin? I just learned that's another one that can cause hallucinations.

My pdoc doesn't know whether my psychosis is med induced, hypomania induced, or a product of schizoaffective. So I'm kind of not in-the-know right now either. But I have had hallucinations that are just sounds, not music or voices, though I get those too...although not very often.