Is it possible to add PA announcer sounds like give aways or any other sort of things ? 
 
Can vendors sounds be added to the crowd sounds ? shouting to sell Hot-Dogs ,Lemonade,Ice Cream and all that stuff ? 
 
If there are no free slots or no addable slots would it be possible to add another sound to already existing crowd soundfiles ? so that Vendor sounds would be played while crowd sounds are played ? 
 
I would be really interested to hear your ideas about it.