When I tried JUCE on windows it was slow. pretty but slow. Same with pdlork on linux. I tried the latest autobuild of extended as well as the 0.43 vanilla from sourceforge. both installed fine withh Ubuntu software center. they both kept freezing though sometimes it was a toggle tat would freeze it's display or I couldn't get any sound or close dialog after setting audio properties. most of the time stopping and restarting process worked to unfreeze but I had to uninstall them both and put back the version that ubuntu provides. I figured midi start, stop and continue would work with qtractor but it doesn't with any of them so it might bean alsa or qtractor thing. qtractor does sync with jack transpot though. Anywhere I can find extended package deb that doesn't require me to uninstall whats on there ?