Probably an old discussion,but here goes anyway:

I routed my drums (hh/sn/bd/tom/oh/perc/etc to Bus 1 while I routed my Bass sounds (uh..bassguitar,basssynth,etc)to Bus 2 .Now I want to make a fadeout and fade-in in the middle of the song with those two groups ,while the rest of the orchestra(..) remains at the same volume .

Any quick way or workaround to do this ? I'm not much in the mood to apply
separate envelopes on each track(14 total)ofcourse .If someone has a quick solution that has another "route" than using those 2 busses ,fine too.

Thanks!