Hi , i am probably not the most experienced person around here , but here some tips from me as a rookie hyperspacer.
1-Music is nice to create a relaxed atmosphere (setting), but during the experience you probably won,t hear it , when i vape it,s like someone turns the volume of the music down.
2-Don,t know , never tried.
3-It,s impossible to imagine the unimaginable , it.s like nothing else , words can,t describe it,
4-Thats always possitive i guess.
5-If you have no experience with things like shrooms or acid , and you want to do DMT ,start with really low doses. 5-10 mg and take some time between the sessions.
But i advice to take it easy , don,t hurry to become a psychonaut , if you take your time inbetween trips you have a wonderfull hobby for the rest of your earthly stay.
Happy travels