yeah, folders rock. For AD and JS, I also do the multi out like Pete explained and then make a new track with comp/eq and set that as the top of the folder and last drum track as the last in folder. If you look at the routing matrix after this, you will see that the track that AD or JS is on will no longer be sent to the master bus, but instead to the individual tracks built by REAPER, and the individual drum tracks are sent to the folder master. I like this approach because then each individual drum track can be eq'd/comped to taste in AD od JS as well as the REAPER tracks and the folder master is the buss compression/eq.