Hi,
I have been having this problem off and on for a while, but never thought it would do any good to post on this forum about it. However, I have a lead now.
I have an Edirol FA-101 hooked up to pd in Ubuntu Gutsy, with the rt kernel. If pd is running by itself, everything sounds great. If jack is running in non-realtime and there are lots of things going on, everything sounds great except there are big pauses in midi/audio throughput. If jack is running in realtime everything BUT pd sounds great, while pd produces feint pops, with feedback.
And what I just noticed today, if I start another JACK application afterwards, the pops go away and everything is runnnig smooth in realtime. I don't know if it is just any application, but what I am explaining happened when I opened audacity to try to record the output of pd's wierdness.
I've only had this issue with pd. Does this make sense to anyone?
-rich