The audio portion of REAPER suited my purposes just fine. My previous license only applied up to version 3.78 which I have been happily using up until now because the main reason I would have for updating my license would be improvements to the MIDI editor, which were not up to snuff IMO until just recently. I have been using REAPER since version 2.x. Take a look over there <- at the date I joined this forum. Your demonstrating something completely out of context to do what? Nitpik and prove my statements weren't absolutely true? Impress me with your expertise? And, if the OP were using a custom setup, they probably would have (or should have) mentioned it. But the common user is going to use the method that's easiest for them. If your building your own specially designed multi out setup, knowing these things are important. Who on earth would do such a thing? From a practical stand point, why would anyone do such a thing? So, your adding tracks to otherwise perfectly working muti out scenarios. I use an Alesis DM10 kit for VSTi controller. Mapping, is telling MTPD which notes from your controller to use for which drum or cymbal. Make sure you are using either all or just channel 10. Now in that track control there is a listing for midi input. Note you need to have the new track 'Armed' for record to be able to hear/monitor anything until you record some midi data. Drag MTPD to the empty space and a new track will be created for you. That should open your FX browser and list all of your VSTi.

In your project Opposite Click on empty space under the track control in the track panel and pick Insert virtual instrument on new track. Make sure Reaper sees your midi controller: Options>Preferences>Audio>Midi Device. Point to that by: Options>Preferences>Plugins>VST. In Reaper you need to make sure that the folder that contains MTPD is seen by Reaper. MTPD uses midi channel 10 by default, so set your midi control to that. Try that and then see if it recognizes your midi controller. You should be able to run it all by itself. First off MT Power Drums will run in stand alone mode.

Mt power drum kit help