*EDITED*
Changed my mind on something. Since R4 already has an EQ display in its sound settings menu, would it be possible to just turn it into its own scene? This would give us many bars to work with, pre-tweaked to accurate and responsive pulses (something I'm noticing seems to be off even when tweaking), and then we can just work on coloring effects. It would also help us with another problem....
I seem to notice that var[0] (for example) doesn't respond to every part of sound a equally. In my listening, it seems to respond a bit better to mid to upper range of sound in the sound a section. It'll pick up upper bass notes ok, but nearly unresponsive to the low notes. And even though var[0] is set to only use sound a, it was responding to snare hits but not much to bass kicks. Not sure what's going on there. Sound settings are:
Sound A: 0-170
Sound B :170-340
Sound C: 340-511