One of the more common techniques associated to microsound is granular synthesis,
book >> "microsound" by curtis road
pd tutorial >> http://www.pd-tutorial.com by Johannes Kreidler 3.7 granular synthesis
PD granulators: particlechamber by Derek Holzer http://puredata.info/community/patches
pulsegrain by nullpointer
http://www.nullpointer.co.uk/-/pd.htm
nm-grainer by Nick Mariete
http://puredata.info/Members/nmariette/granular-implementations
granulator by ch in the externat lib nusmuk included at
pd-extended
also try to check at "pd-list archives"
salut!