1. A method for differential dynamic content delivery, the method comprising: providing a session document for a presentation, wherein the session document includes a session grammar and a session structured document; selecting from the session structured document a classified structural element in dependence upon user classifications of a user participant in the presentation; presenting the selected structural element to the user; streaming speech to the user from one or more users participating in the presentation; converting the speech to text; detecting a total sound level for the user; and determining whether to display the text in dependence upon the total sound level for the user.