Currently, there is some support for tabletop audio through roll20's jukebox, however tabletop audio has recently released a soundpad out which contains things such as sound effects and several tracks of music. Some of which are incredibly good in my personal opinion There are (currently) 18 different sections by default, none of which can be accessed through roll20. It would be very nice to be able to use these in games. The sound of a weapon clashing into a shield when you miss, steel biting into flesh on a hit, these are all things that if used properly greatly improve player immersion.