I have successfully used PD with JACK at a buffer size of 64 with no problems. I also posted a patch to the list to fix a jack client close bug, which I recommend be included in the package.
Just to clarify, I mean the pd-dev list. I would be happy to send you the patch if you wish.
I got the pathes from the list (thanks!!). Sorry for the waste of bandwidth, pd 0.37 works with jack, I just mixed up versions while building and testing :-(
What version of JACK are you compiling against BTW?
0.80.0
Although it can work at less than 512 frames with jack, it quickly becomes unusable. I guess the gui is still tied too closely with the audio processing...
One curious behavior I found is this:
-- Fernando