Jack 0.120.2 is now available. http://jackaudio.org/downloads/jack-audio-connection-kit-0.120.2.tar.gz This is primarily a bug fix release, though some of the bugs are important. Fixes/Changes * Fix issues with stack initialization in client threads that stole large chunks of the stack from applications. * if the ALSA backend finds that a device is busy, try to tell the user what application(s) are using it. * Reimplement the jack_cycle_wait/jack_cycle_signal() API for OS X, where in previous versions it was completely non-functional. * extended documentation for the transport API data structures. * extended documentation for the JACK Session API * more useful warning message when duplicate port registration is attempted * fix logic for setting up device parameters in the ALSA backend (fixes JACK startup on some ALSA-supported devices that would report "impossible sample width (1) discovered" during startup).