AsFFT Xtra
From Director Online Wiki
The asFFT Xtra by Antoine Schmitt enables direct access to all audio devices and their various inputs on the user's host machine. Optionally it can perform a FFT on the audio data of the selected input. The Xtra also is Shockwave safe and so can be used for online projects.
Concepts
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Example code
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See Also
A complete lingo wrapper script (with extra functionality) for the xtra is available at http://toxi.co.uk/zips/asFFTWrapper.ls
Projects using the Xtra
The hub - open source music visualization engine
Download
The latest version of the Xtra can be downloaded from Antoine Schmitt's website: http://www.as-ci.net/asFFTXtra/. Registration fee is 30 Euro.