my diy library (work in progress) is not all pure pd, but fair chunks of it are.  it shouldn't be too hard to rip the dsp guts out of some abstractions for your purposes.

http://www.m-pi.com/DIY2.zip

or

http://puredata.hurleur.com/sujet-1982-diy2-effects-sample-players-synths-sound-synthesis