I'm having a bit a problem with pd. It runs fine most of the time, but every once in a while there are DIO errors. Changing the "delay" setting doesn't seem to do anything. The pd CPU load is at most 5% and 1.2% in jack Pressing the DIO errors button reveals "A/D/A" sync and "unknown"
The patch is only doing some logic and playing back wav files.
first of all, changing the delay, doesn't have any effect if you are using jack ...
for the DIO errors ... pd's dsp scheduling is independent from the hardware, which introduces additional latency and sync problems aren't necessarily xrun problems ... for the developer branch, i changed the scheduler, so that the dsp is computed during the jack callback ... this reduces latency and might help in you case ... installing is easy ... get devel_0_39 from the cvs, scons and scons install ...
i hope this helps ...
cheers .... tim