Hello,
I'm using pd-extended 0.43.4, installed via Hans-Cristoph Steiner ppa. I'm using this version because I can't install the stable version in Ubuntu 12.04, I'm using Dream Studio distro.
The problem is, when I start pd with Jack in -rt mode or wherever mode, if I turn on dsp, they work well, but if I turn off, and try to turn on yet dsp, pd-extended freeze...
Closing Qjackctl (after some time ubuntu can close that) pd-extended returns to work, and I can use on alsa directly sucessfull..
The qjackctl version is:
Version: 0.3.9
Build: Jun 1 2012 20:02:59