Cycling74 are building up and excellent set of video tutorials, which I have only recently discivered.

Interpolating presets is a technique I like to use a lot in performance as it allows me to establish aesthetic markers in compositional terms and then then allows me to work between them.

The pattrstorage object can interpolate between presets using

via pattr #3 Tutorial « Cycling 74.

There is pattr quickstart here

and pattr tute 2 here

Also see other tutes