For the most part it was derived from Voxengo GlissEQ dynamic parametric equalizer and reproduces its spectrum analysis functionality.

Changes in SPAN v2.3

• Right/left signal power difference readout added.
• “Filled Spectrum” spectrum display mode switch added.
• Level meter’s “density mode” improved.
• Control surface crosshair option added (can be switched off in the global options).

SPAN for Windows and Mac (VST/AU) is available as a free download.

Visit: Voxengo