Because Pd needs exclusive access the audio card. Jack abstract that creating various streams of audio data and then routing it to the playback device.

2010/6/30 Matteo Sisti Sette <matteosistisette@gmail.com>
On 06/30/2010 08:41 PM, Pedro Lopes wrote:
I strongly advise using "Jack" as the audio engine in Ubuntu.

Ohhh! Thanks.
I thought Jack was ("only") a sort of "virtual audio cable" for connecting the output of an app to the input of another. I guess it is _also_ that.

Anyway, just out of curiosity, why cannot two pd's using oss or alsa both work simultaneously while other apps apparently can?


Thanks
m.

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