and all what has to be found on the net now, thanks to everyone and particularly Miller, is the brand new pd 53.0 :
At the bottom of http://msp.ucsd.edu/software.html click <http://msp.ucsd.edu/software.html click> click on "directory listing of all downloadable files" and it will lead you to http://msp.ucsd.edu/Software/
BTW, be careful with 0.52-2 because there is a serious regression in the [readsf~] object (which has been fixed in 0.53)
Christof