Visualizer is a comprehensive and flexible FFT audio analyser designed to allow access to a full range of audio analysis views via a single resizable interface, using a unique intelligent window system to manage the controls and screen layout.
Features include:
* Multiple level meters (Peak/RMS/K12/K14/K20 etc.).
* FFT Spectrum Analysis.
* Stereo Spectrum Analysis.
* Spectrogram.
* Stereo Spectrogram.
* Vector Scope.
* Stereoscope.
* Stereo Bias meter.
* Correlation Meter.
* Stats and Parameters module.
* Resizable Interface.
* Intelligent window optimisation.
* Optimized control selection.
* Frequency zoom and scroll.
* dB Zoom and scroll.
* Peak hold control.
* Colour selection.
* FFT window selection.
* RMS window adjustment.
* A/B snapshots.
* Multiple freeze options.
* Control "link" facility.
* Optimized resource use.

More info
http://www.kvraudio.com/get/2170.html