Hey anyone

I have to make a homepage from were I need to mix/generate sound around a pavilion exhibit in Venice this summer.
Right now we are trying set up a homepage in processing, were we track the traffic (movements of bytes on the database) and together with a premade composition we will sreate a dynamic soundscape.

I'm trying to make a real-time mixer, were users on the web can change, 3 sound output around the structure... is that even close to be realistic?
Do anyone know if it is possible in Puredata?
And what about processing?
Or just anything...

Hope you can help me guys
Best regards
Esben