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
