Hi.

Just a quick note to tell you that the problems with muting of a track seems to be solved with latest revisons of MLT and Kdenlive. You can now easily mute a track by clicking on the small speaker icon.

Bug originally reported on the old forum as:

http://www.kdenlive.org/forum/viewtopic.php?f=19&t=106

Let me know if any of you still find problems, but my quick tests seem to indicate that this issue is now fixed.