How do I create a bus where all channels go into that, and DON'T simultaneously go to the master for example a drum bus where you want all the drum tracks to be affected by the comp and EQ, etc? I can't seem to figure this out!
Create a track called "Drums" and put it above all your drum tracks. Then click the folder icon on the track called "Drums" until the tracks below it move to the right. Go to the last drum track and click it until the folder icon turns red so REAPER knows thats the last track in the folder. Then just put your FX on the track called "Drums".