Thanks tim. ( I realize that the jack issue is separate, I just wanted replies to focus on pd and not jack -- (so they wouldn't say: "check jack!"))
oh yes ... to change the audio buffer size ... check jack ;-)
It's kind of a pain to hear clicks. I've reduced them somewhat by starting pd with no audio capture. Don't know why that would be since I'm not using that facility.
well, i doubt this will have a big effect ... it might make sense to disable the audio input in jack, though ...
also, it might be interesting to see, what how the native alsa interface performs ... i've had some trouble with my hdsp ... having a feedback ... but either it was a problem of the specific machine or i was the only one ever trying alsa/hdsp/pd ... so you might give that a try, too ...
cheers ... tim