Hi there:

A bit of background: I'm trying to obtain a reading on the EQ characteristics
of my favorite well-produced recordings, and from what I've read about the
spectral opcodes in Csound, I figure these might at least get me close. (I
might otherwise spend half a grand on Arboretum's Ionizer, and who has that
kind of bread?)

So I write a bogus orc and sco with several of these procs, which look like it
should compile (I can provide these if anyone cares). I click Render (as
mentioned, I'm running 3.493 on PPC). Perf immediately laughs at me, saying
that I'm not using a valid opcode, which I didn't expect. The rest of the
compile twitches and dies because of undefined variables, which I expected at
this point.

I run the compile again and turn on the option to display all opcodes. It
turns out there are *two* invalid opcodes in my orc: octdown and noctdft-- the
very two I need to run the rest of the orc. Bummer. However, in the list of
opcodes, I note the presence of one called spectrum, which doesn't seem to be
covered in any of the various online texts about Csound.

Could someone enlighten me as to the care and feeding of this opcode? Does it
do what I think it does?

Right, cheers, thanks a lot,

Rick

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