SPAN 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. Beside that you can choose to display secondary spectrum of a desired type (e.g. You may specify Fourier block size in samples, FFT window overlap percentage, spectrum's visual slope. SPAN provides you with a very flexible “mode” system which you can use to setup your spectrum analyzer preferences. SPAN is a free real-time “fast Fourier transform” audio spectrum analyzer AAX, AudioUnit, and VST plugin for professional sound and music production applications. RMS, true peak level, and clipping detector.Stereo, mid-side, surround spectrum analyzer.
Fast Fourier transform spectrum analyzer. You can find links to other useful Open Source audio and audio-visual applications, that you can download and use, in the Audacity Wiki. Other Open Source Audio and Audio-Visual Applications You may copy, distribute, modify and/or resell Audacity, under the terms of the GNU GPL. To build Audacity yourself, download the source code. 
Although there are a number of sellers of Audacity software on ebay, Amazon, Microsoft Store and Apple Store, none of these sellers are affiliated to Audacity, and none have contributed in any way to the Audacity project. Source code and user manuals for some old versions are available on FossHub, as well as AppImages since version 3.0.3. For Linux, the appropriate version of Audacity for your operating system is usually included in your distribution’s repository. For macOS 10.12 (Sierra) and earlier, legacy versions of Audacity are available on the Legacy Mac downloads page. For Windows 7 and earlier, legacy versions of Audacity are available on the Legacy Windows downloads page.
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