And you can always tweak using other tools in Reaper -) To my (inexperienced) eye, there seem to be not as many possibilities to tweak Midi/channels/input/output as with e.g. The Garritan runs through the Aria player. I think it will be ok if you use the instruments as sections, e.g. Well, the Garritan Jazz & Big Band 3 gives you many sounds, not only many horns (saxes, clarinets, trumpets, trombones) but also some basses, drums, keyboards.
