There's something fishy going on in .18 and onwards. In .17 I can do jack_capture -c 2 -p system:capture_9 -p system:capture_10 to record the spdif on my Audiophile 2496. In >= .18 I get a segfault, the only thing I can run is jack_capture -c 2 -p "system:capture*" to record the 1 and 2 ins. I'm running jack-0.112.0-svn2557 non-realtime with 2048 fr/per on OpenSUSE 11. strace-logs here: http://www.musikhuset.org/~peder/JC17.txt and http://www.musikhuset.org/~peder/JC18.txt And a trivial note: once you've started the GUI there seems to be no way of ending it apart from Ctrl-C or killing the process. - Peder