Sonic Visualiser is an application for viewing and analyzing the contents of music audio files. It is free, available in both 32 & 64 bit versions and works in Linux, Mac and Windows. ++ Sonic Visualiser.org ++

This looks great Jim. Have you tried it and if so, what did you find it useful for?

I haven't tried this particular program but have looked at and used similar programs. The main idea is you can visually analyze your tracks as you see frequency and time as well as amplitude all in one view.

If your mix sounds muddy you view the frequency content of individual tracks then can have an idea of what tracks and frequencies are clashing. Sometimes you'll find a subsonic frequency or a phase issue you can't hear.