Voxengo SPANVoxengo SPAN 
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Voxengo SPAN. SPAN is a free real-time “fast Fourier transform” audio spectrum analyzer AU...
SPAN is a powerful, free, real-time “fast Fourier transform” (FFT) audio spectrum analyzer plugin available in AU, AAX, and VST formats. Ideal for professional music and audio production, SPAN offers extensive features that provide precise control over your audio analysis process. Whether you're mixing, mastering, or sound designing, this tool helps you visualize your audio's frequency spectrum in real time.
With SPAN, you can easily customize the plugin to suit your specific needs. It allows you to adjust essential parameters like Fourier block size, FFT window overlap percentage, and spectrum slope for more accurate audio monitoring. This flexible system gives you the precision and clarity needed for professional-grade audio work.
Enhance your workflow with SPAN’s intuitive interface and robust features designed for audio engineers, producers, and musicians. Whether you are mixing a track or fine-tuning a sound design, SPAN delivers the tools you need to visualize your audio spectrum in detail.