Keppi is a simple Open Source audio visualizer.

This audio tool adheres K.I.S.S. as there are no real options or bells and whistles to speak of other than the ability to resize the window. You can play your favorite audio and enjoy a visualization. You can add files from local sources, or you do have the option to add a URL or grab a track from SoundCloud. We chose the Tweaking.Com Windows Repair video to test initially, as shown in the first screenshot.

MajorGeeks download contains both 32 and 64 Bit for your convenience.