Hi! As promised I took a look at LiSa and fixed many bugs. See the git commit description in the patch for details. It applies to v1.3.1.0. I couldn't really improve its performance significantly but you may now again compile LiSa as a mono UGen (#define LiSa_channels 1) which does the trick for me. Haven't yet even used a profiler or memory checker on ChucK (but I will sooner or later). Tested LiSa only superficially but some things like tracking mode 1 and 2 are completely broken beginning with v1.3.0.0! Will test them soon and post updated patches if necessary as I intend to use these tracking modes. btw. I see many examples in the ChucK code where comments are used to denote author and subject of a change. Why are you doing that? If every developer writes proper commit messages you may just as well use "svn blame" (or later "git blame") and "svn log". Best regards, Robin