Help with video editing?

Recently I started promoting electronic music and I am using a video editor called KDenlive on Ubuntu Linux. It has an effect called audio wave which basically displays an audio spectrum for the music track but I am having trouble using it. I drag the effect onto the clip i used and all it does is makes the video go black no waves to the music. I do see two lines though but they don't move. Also if its possible i wanna make it so it appear over the clip rather than completely replacing it. If there are plugins that can help me do this please give me a link. If there are any video editors for Linux that can do this also please let me know. Btw no after effects i am an open source only guy!

http://forum.kde.org/viewtopic.php?f=270&t=117650&sid=8b9637fac9d54c397f44b6c6be9f80c3

If you wanna answer on the kde forum that would be helpful as well

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