I believe I did this by reassigning the bus truck to an auxiliary track in the mixer.
The reason I'm trying to do this, is because, when composing full orchestral music, one or more of the sections, (Winds, Brass or strings) will be out of balance with the rest of the orchestra. It's usually best to deal with them as full sections, then fine tune the mix with the individual instruments. Just as you've guessed.
Well, that worked slick! I'd never known what track stacks were all about. What channel strip do I use for putting plugins on, eg. Channel EQ? Setting this up has me puzzled. So, now I have a pair of channel srips as alway. I have the left strip with the little double circle symbol and "bus 7" the summing track, the same for the right channel strip. I've placed a Channel EQ on the right channel strip (although it would only affect the violins). Both channel strips are set to "touch".
I hear sound only for a second or two, but the sound quickly fades completely.