Whole music, I get more than volumes; I get movement, calculations of duration and correlations between timing, sounds and instances; different paths according to the different notes (but with some sort of synchronization), usually galactic. Sometimes that may differ, according to the complexity and vibe of the music. Sometimes I'll render scenarios, earthly (or non-earthly; analog or digital) lyrics and improvs that match the music that I am hearing. I basically become the music and in my mind exists theories, additions, and possibly even subtractions.
I am a musician myself. That isn't even the end of it.