SPAN is a freeware real-time “fast Fourier transform” audio spectrum analyzer plug-in for professional music and audio production applications. For the most part it was derived from Voxengo GlissEQ dynamic parametric equalizer and reproduces its spectrum analysis functionality.
The following features were added in SPAN version 2 since version 1:
* Multi-channel analysis
* Mid/side analysis
* Correlation meter
* Multi-platform support
* Undo/redo
* Preset manager
* User interface coloration
* User interface re-scaling
* Plug-in instance naming
Voxengo SPAN and other professional audio plug-ins can be downloaded at http://www.voxengo.com