OK well I don't mean to say that spectrum watching and matching is useless - just tricky. I'm coming at it from a remastering point of view so there's another thing.
Content, arrangement, key are all pieces of the puzzle both for your audio needing the EQ/Dynamics balance and some commercial reference you may be comparing to.
I'll just throw these ideas out to chew on - or up , whatever the case may be
In a song whose sound field seperation & depth I admire, also where the tempo and instrumentation are similiar to my piece I will take a look at a verse and compare it to my verse on a spectrum analyzer, then I'll do a chopruse, etc. I'll look for stuff like overall freq range, overall freq balance and slopes, and decay times of various bands and instruments within those bands. Kind of making a mental note of what a good mix and my mix both look like on an RTA. I'm listening too of course - this is most critical, hehe.
I'm finding I can make some pretty good spectral adjustments by using stereo balancing and dynamics processors to bring up the bass and lo-mids if necessary, but what I seem to be watching for in the spectrum analyzer is where I have to push transients down - like the guitar at 160Hz that's too loud for a few seconds as it hits some resonant thing somehow, or maybe a 4KHz spike on the vocal cause they forgot to work the mic. That kind of stuff I can usually get with a combination of Soniformer2 (32-band MB) and possibly using a spectrum match like CurveEQ. So the combination of the dynamics processor pushing down along with a touch of subtractive EQ is how I try to repair stuff - that's when I first ask Mr. Bob Ludwig to borrow the slope of the track I like...
CurveEQ can then compare the reference with my piece and calculate a 12 point EQ (a pretty broad slope). Then I adjust it so it's pushing down where I want a couple of dB...I can also allow it to adjust the general slope up a few dB per octave if I want it brighter, etc.
A pro would simply do this by ear - some of you guys here qualify for that. I'm sure I'll be doing that too as time goes on also. Of course if I was mixing I would just do a remix but since I'm doing a remaster I operate on the 2-buss in stereo and on the mid-side components. Sometimes just adjusting the slope of the sides on a muddy mix can help a lot too. Since I'm in headphones now (moving - speakers are packed and shipped to Tennessee) I would be doing zero audio without spectrums & matching - don't get the wrong idea about phones though - that's another thread too

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Anyway - tricky is what we're saying for spectrum & curve matching. I'm calling it a good home learning tool - I would rather have sat in one of your guys studios and watched & listened but I gots what I gots !
Happy Spectruming everyone !
