[Fluxus] fft audio fixes

[Dave Griffiths]

Hi all,

I've just taken out a lot of nonsense from the fft audio in an attempt
to make it better. There are no magic numbers in there any more, but I'm
getting a bit more response from the treble end than the bass end at the
moment, so it's not perfect yet. If you play in white noise you'll see
what I mean.

I've also made the number of bins (gh) uses configurable, up to 128,
with (set-num-frequency-bins). 

cheers,

dave