thought i'd add some more to this:
Sigmatel, it works great. Second, by setting windows xp to run pd at real-time priority. You do this by right clicking the pd process in windows taskmaster and setting it to real time.
there's a nice little command line utility called "process.exe" that allows you to set application priorities from the command line. so - no need to open the taskmanager and right-click something.
i used it several times with the "system" object from the motex library:
http://www.reverberant.com/PD/index.htm
(for whatever reason, the DOS "start" command which is suppposed to be able to pass a priority flag to the started application didn't work with PD.)
good to hear that you guys had good experioences with asio4all and PD. i can remember that it had some stability issues with MAX/MSP when i tried it once.
ciao
oliver