Voxengo SPAN Free Spectral Analysis Plugin By Voxengo


SPAN Free Spectral Analysis By Voxengo, is a free graphical spectrum analyzer based on the FFT concept (Fast Fourier Transform). The plug-in is available as AU and VST for Mac and Win. With an RTAS wrapper you can also create a ProTools version, at least that's what the internet claims.

SPAN visualizes the frequency image of a mix, individual tracks or even groups of instruments. In addition, the plug-in provides information about volume, average loudness (RMS) or the dynamic headroom of the level peaks (Crest Factor). With dBFS, dBFS+3 and six K modes, different representations of the volume level meter can be selected. With the "Hold" option, a snapshot of the frequency image can be displayed. For monitoring clipping or the balance of the stereo image, two corresponding displays can be found in the lower right-hand area of the Graphical user interface.

SPAN also offers two very helpful features. Firstly, while a mix is being analyzed, you can move through the mix with a narrow-band frequency solo function by mouse and pressed Ctrl/Apple key, graphically represented by a steep "EQ bell". In this way, suspicious characteristics in the analysis graphic can be quickly heard separately and certain problem sources in the mix can be quickly detected.


  • Output signal power statistics
  • Spectrum smoothing 
  • User interface window resizing 
  • Clipping statistics 
  • Correlation meter
  • K-system metering (unweighted) 
  • Stereo and multi-channel analysis 
  • Mid/side analysis 
  • Internal channel routing 
  • Channel grouping 
  • Preset manager 
  • Undo/redo history 
  • A/B comparisons 
  • Contextual hint messages 
  • All sample rates support

Voxengo SPAN Free Spectral Analysis Plugin Review:

System requirements:

  • This audio plugin can be loaded into any audio host application that conforms to the AudioUnit or VST plugin specification.  Plugins with AAX version available can be loaded in ProTools 12+ 
  • RTAS compatibility is available by using the FXpansion VST-RTAS adapter 
  • This plugin is compatible with Windows (32- and 64-bit Windows XP, Vista, 7, 8, 10 and later versions) and Mac OS X (10.6 and later versions, 32- and 64-bit, Intel processor-based) computers (2 GHz dual-core or faster processor with at least 2 GB of system RAM required).  A separate binary distribution file is available for each target computer platform for each audio plugin specification 
  • Compatible Windows and Mac OS X software: Cubase, Logic Pro, Ableton Live, ProTools, Reaper, Cakewalk Sonar, Presonus Studio One, Nuendo, WaveLab, GarageBand, FL Studio, Sony Vegas, SoundForge, Adobe Audition, Samplitude, Digital Performer, Mixcraft, Bitwig Studio, Edius, others


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