All, I noticed since upgrading to Ubuntu 12.04 that the default Jack server is jackdmp (v.1.9.8). Please correct me if I am wrong but my understanding this is the smp-enabled version 2 that is being developed in parallel with 1.x series of regular jack. Either way, one of my concerns is that while in the old jack when one accidentally pulled the soundcard jack was trying to talk to (e.g. a USB soundcard), the jack would gracefully stop. The new version (and this could be Ubuntu quirk) instead of stopping is pegged in some kind of a spinlock that often times locks up the machine (this may be in part since I am running a lowlatency kernel with audio group given priority) and at times keeps it operational while hogging the cpu and making the computer barely responsive until jackd is killed. Apps connected to jack that I tested so far are also stuck in a loop waiting for a response from jack (although this could be the app's shortcoming)--jack never broadcasts a signal that it has lost the soundcard (AFAICT). FWIW I am running jackdmp through qjackctl... Any thoughts on this matter would be most appreciated. Ivica Ico Bukvic, D.M.A. Composition, Music Technology Director, DISIS Interactive Sound & Intermedia Studio Director, L2Ork Linux Laptop Orchestra Head, ICAT IMPACT Studio Virginia Tech Dept. of Music - 0240 Blacksburg, VA 24061 (540) 231-6139 (540) 231-5034 (fax) ico(a)vt.edu http://www.music.vt.edu/faculty/bukvic/