I would suggest taking some time to check out Curtis Roads’ work.
http://www.asphodel.com/artists/view.php?Id=52&SessionID=573c139b4831aaeac90bc

He has been using and refining grunular synthesis techniques for decades now. To really drill down into this area also, check out his book, “Microsounds” on MIT press. It is the definitive text on granular synthesis theory and technique.
http://mitpress.mit.edu/catalog/item/default.asp?ttype=2&tid=10389

Scot Gresham-Lancaster
http://scot.greshamlancaster.com