Voxengo SPAN: Audio Spectrum Analyzer-Freeware Plugin Cross Platform

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“SPAN is a real-timefast 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.

SPAN provides you with a very flexible “mode” system which you can use to setup your sound analysis preferences.  You may specify Fourier block size in samples, FFT window overlap percentage, spectrum’s visual slope.  Beside that you can choose to display secondary spectrum of a desired type (e.g. real-time maximum, all-time maximum).  Spectrum can be visually smoothed out for an easier examination.

SPAN supports multi-channel analysis and can be set to display spectrums from two different channels or channel groups at the same time.  Spectrum’s color can be chosen to taste.

SPAN also features output level metering with adjustable ballistics and integration time, K-metering (including calibration K-metering).  SPAN displays level metering statistics, headroom estimation and clipping detection.  Correlation metering is available as well.

Soundmagic Spectral For MAC OS X: Freeware Suite of 23 Audio Unit Plug-Ins

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Reference

SoundMagic Spectral is a FREEWARE suite of 23 Audio Unit plug-ins that implement real-time spectral processing of sound. This groundbreaking set of effects give you unprecedented control and creativity in the processing of audio, whether from static audio files or live audio streams. SoundMagic Spectral builds on the work of the OS 9 software known as SoundMagic DSP, and takes it to even more exotic sonic realms.