yeah gross beat is all fine and dandy but if you want to sidechain for something that isn't in a 4/4 time signature, you need to use the limiter.
haha, nope, it still works.
it just goes through only the first three beats in the case of 3/4
in the case of 5/4, it loops around and replays the first section. this might cause problems though so just use a limiter (or peak controller?) if you like to work with odd handicapped time sigs.