It supports multi-channel analysis and can be set to display spectrums from two different channels or channel groups at the same time. Spectrum can be smoothed out visually for an easier examination. Besides that, you can choose to display the secondary spectrum of the desired type (e.g. You may specify Fourier block size in samples, FFT window overlap percentage, spectrum's visual slope.
It provides you with a very flexible “mode” system which you can use to set up your spectrum analyzer preferences. For the most part, it was derived from Voxengo GlissEQ dynamic parametric equalizer and reproduces its spectrum analysis functionality. Voxengo Span is a free real-time “fast Fourier transform” audio spectrum analyzer AAX, AudioUnit, and VST plugin for professional sound and music production applications.
