[PD] Simple spectrum grapher in PD?

[Larry Troxler]

I searched the FFT examples directory in the doc, and can't find exactly what 
I'm looking for, which a patch that will periodically do an fft and write the 
spectrum to an array. This would be just for rough monitoring purposes - it 
would be fine if the FFT were only computed once per second for example, with 
a fairly small frame size, and the result written to an array for graphical 
viewing. I imagine that this is a reasonable and common request, but I can't 
find anything in the examples that does this. 

Also, is there any documentation for "block~"? I seem to remember reading some 
somewhere, but now I can't find anything. "Help" on the right-click menu does 
nothing.

Thanks, everyone!

Larry Troxler