You can do the Dave Rat thing where, for example, he might assign all the individual drum channels to a DCA. With a comp on the drum group, if he wants a more compressed drum sound, he raises the drum channels DCA, driving the drums into compression. If he wants a more dynamic drum sound, he lowers the DCA so the drums drop out of compression. To maintain the same volume, he lowers the group while he raises the drum DCA, and raises the group when he lowers the drum DCA.
