I use compressors quite often and I am quite familiar with their use to control dynamics but I haven't really got a good enough grasp of multi band compression.
From what I understand, the equivalent would be to put your signal through a number of parallel BPFs crossing over at adjacent frequencies, compress their outputs separately and then mix/add them back together. Please correct me if I'm wrong.
But as you apply a different amount of make-up gain on each band, doesn't this affect the tonal balance of your signal? Is this something you use them for? Or is it a side-effect that you should compensate for?
How do you decide where to place your crossover points?