Changing patches in Zynaddsubfx is all around pretty nasty (not realtime friendly). Perhaps use Yoshimi instead or perhaps increase your jack buffer size. On Mon, Jan 18, 2010 at 10:51 PM, Robert Persson wrote: Hello Has anyone got the sirlab vocoder or either of its derivatives (the ladspa and lv2 plugins) working properly? If so, which version(s) are you using, and which version(s) of jack and/or any plugin hosts are you using? I have been trying to use v2.9 of the standalone, v.3 of the ladspa plugin and the current version of the lv2 plugin. The standalone plugin barely works; as soon as I change a patch in zynaddsubfx, one or both applications will crash. The LV2 plugin is completely non-functional. It crashes Ingen every single time an attempt is made to load it. It crashes lv2rack more often than not. On the occasions when it does load successfully into lv2rack it behaves really weirdly. It kills all sound to the right alsa out channel, so that no jack client can use it, whether or not that client is directly connected to lv2rack. It makes no sound itself except for the occasional squeak. I can't give you so much detail on the ladspa plugin right now, beyond to say that it really doesn't work either Is it worth persevering with the vocoder, or is it really not usable at the moment?