SPAN, a real-time FFT audio spectrum analyzer


SPAN is an audio spectrum analyzer that has two important features: works in real time and is based on Fast Fourier Transform. These are supplemented by a third interesting feature, not of a technical nature, equally important: it is a free software.

This application is presented as a professional software designed for professional goals, interesting both for the composer and for those who deal with much more general issues related to audio, outside or inside a studio.

There are many features with which this software has been equipped:

  • Output signal power statistics
  • Clipping statistics
  • Stereo and multi-channel analysis
  • Spectrum smoothing
  • Correlation meter
  • Mid/side analysis
  • Preset manager
  • Undo/redo history
  • All sample rates support
screen-shot-span-free-fft-spectrum-audio-analyzer

An image of SPAN, which allows us to see how clear is the graphical interface, for a instant use.

SPAN has been designed with a very intuitive interface that make it very easy to use and allows you to appreciate its full potential. I’m not going to dwell much on issues concerning the use of this software, since the distribution is followed by two manuals very well done and complete for all topics. There is a brief user guide, dedicated to SPAN, that you can read here (a French version, and German are also available):

in addition, there is a general guide dedicated to all plugins designed by Voxengo. Even this you can read here:

or, if you are interested in the French version click here, or if you interested in the German version click here. Finally, if you want to download the English version, this is the link.

Above I have listed only a few of the many features and functions that relate to this software. It should be noted that technically it is a plugin, so it requires to run lean to another software called “host”, able to handle full VST, VST3 or AudioUnits, the latter for Mac users.

I want to remind you, finally, that SPAN is available for both Mac and Windows operating systems, from XP to Windows 8 via Vista. If you want to download the version for the Mac this is the page, but remember that you must have first installed the application AudioUnits, you can do this one by following this link. If you are a windows user, your link is this.  If you have any doubt, please consult the official page for this software by clicking here. If anyone has experiences to tell, it would be very useful to read in the comments.

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