Hi everyone,

I'm having an issue with audio output in PD : when setting audio to output via portaudio, all the audio that gets out of PD has audio glitch in it, some kind of random-spaced crackles or clicks. It is completly useless as such. Increasing the delay in PD's audio settings doesn't change a thing.
However, using Jack as an audio outlet supresses all this problem, and the audio is clean that way.

Would anyone know the reason for this? I would be glad to know it as there may be a link with another issue about audio on my hardware : system audio of mac os X has the same kind of glitches that I got with PD on portaudio, only it's only occasional glitches so it's bearable. Solving this issue would be a big relief to me.

My hardware is a hackintosh (pc with osX installed on it), and mbox2 as audio interface (but I have tested with an m-audio transit and I have the same crackling issue). My soft is osX Snow Leopard 10.6.5.

Any help appreciated!

Doesn't anyone have a clue?

If it happens outside of Pd, it sounds like a hackintosh problem. Portaudio just communicates with CoreAudio (and not that well, I've found). I don't have this crackling issue on my Mac. But it sounds like you've found a workaround already: use Jack. Jack performs way better than Portaudio on OSX, anyway.

Re: portaudio glitch --
You may have a latency problem. Try PD pulldown menu >audio setup > Try increasing your delay(msecs) to 100. This may correct the problem. you can also mess with the sample rate but I think delay(ms) is your best bet. You can also put in delays in your program. I think the problem is your processor needs some time delay to route your signals.