Well, now that I know ecasound's rtnull is not meant for use with the kind of thing I was trying to do and remembered that you can't add a chainop to 2 chains at once ... This whole thing works in one ecasound instance, with or without jack ... I feel really foolish for making all this noise on the lists all week ... <hangs head in shame> I'll try to write up something for the ecasound docs to explain this so others don't make the same mistake. There is still a slight zipper noise in the -ea: controller. Steve seems to think that's related to the analogueOsc somehow, but I don't see how it could be since the plugin doesn't have an amplitude control. The glitchiness in the audio output seems to be pretty much gone. It was probably a symptom of the xruns due to the rtnull object and the rest of the settup running off different clocks (system vs. soundcard). One weird thing, though. Before I remembered to split the doubled chains out into separate lines I tried to get the previous version to work with -i:null instead of rtnull. It worked to play via jack, but, as soon as I connected another ecasound to the first's jack ports the first ecasound got kicked out. I haven't tried checking on the .ecs problem, yet. But, I'm guessing I probably just messed something up with that, too. :( Oh well. Thanks for everyone's help. The working ecasound only version is attached. Sorry for cross-posting again, but since I went and spread this "problem" all over 4 different lists, I figured I should wrap it up on at least 2. I figure most people on LAD and jackit-devel are probably on LAU, too. The upside is we have another positive experience with the patched 2.6 kernel to report. And for myself, I'm finally using this controller I bought almost a year ago to have some fun making sounds. I can go ahead and write my randomized ECI versions as well. I'll also look into adding interpolation to the analogueOsc Hz control. Thanks, Eric Rz.