I have this problem with the audio of my computer.
When i start pd-extended the audio seems to be only working for pd. If I am playing music from my harddrive or from youtube it just stop until I close pd.
I use Elementary OS Luna (based in ubuntu 12.04) and install pd from the official repositories(http://puredata.info/docs/faq/debian)
I've alredy googled the issue but i could find anything.
Anyone? I would appreciate the help.