[Fluxus] (ga) now works with (process)

[evan.raskob [lists]]

I made (ga) work with the (process) command so you can render audio in  
non-realtime mode.

It's a bit hack-y - the FFT updates every frame (including the offset  
into the loaded audio buffer), so I snuck the updating of the audio  
buffer itself into that same function.  They should be in a single  
function, but calling that GetFFT() is a bit opaque.  Anyway, it works  
for now!

Cheers
Evan