Does anyone know of a really good, fast FFT implementation in AS3?

I write a lot of audio signal processing code in AS3, and some of it uses FFTs 
(Fast Fourier Transforms) which can be pretty CPU intensive.  I have my own AS3 
FFT which is pretty good (about 15x faster than the one in as3mathlib), but is 
nonetheless ~7x slower than my own C++ FFT on which I based my AS3 version, and 
over 20x slower than highly optimized native FFT implementations (e.g. the one 
in Intel IPP).

I've looked into Alchemy, but unfortunately it doesn't appear to have any 
efficient means to pass Vectors of Numbers :-(   I've come across a few blogs 
where people discuss the possibility of doing FFTs with PixelBender, but I 
haven't found any implementations yet.

-Gerry Beauregard


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