I am running Debian lenny; with a home-baked RTkernel (linux-2.6.29.6-rt23). I built Jack with no problem; I am even getting 2.67 ms latency without no Xruns using my laptop's sound cards. I installed ZynAddSubFX via the 'Add or Remove Programs' Gnome Applet. It runs like a dream; I can load up the PADSynth and play lots of notes really fast with out so much as a click. I created a neat sounding string/voice patch and saved it, and here is where I encountered the problem. I opened the patch, and began to play on the keyboard -- no sound. I restarted Zyn, and had no problem playing the factory patches, however all went silent as soon as I opened my patch, even the factory patches. I repeated this process, this time with the Jack connection manager in view. Sure enough, as soon as I loaded my patch, the output plug for ZynAddSubFX dissappeared. Now I get curious. I start Zyn from the terminal, and everything seems fine. As soon as I open my patch, I get the following message: " zombified - calling shutdown handler " Any help solving this issue would be most appreciated, especially since Zyn is one of my absolute all time favorites. I will continue to work on this and post my progress. I have tried to compile Zyn from source, but I can't get fltk to work properly, hence downloading the binaries. Thank you all. ----Adam