Voxengo SPAN is a real-time “fast Fourier transform” audio spectrum analyzer AU and VST plugin for professional music and audio production applications. It provides you with a very flexible “mode” system which you can use to setup your spectrum analyzer preferences. You may specify Fourier block size in samples, FFT window overlap percentage or 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).
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