Setting up multi-out instrument routing confuses a lot of users. Head over to the REAPER Stash and grab Hopi’s Reaper VSTi Routing Tutorial and Guide. I must say, Hopi did a great job with this tutorial
A Guide and Tutorial aimed at helping New Users get going with routing for a Multi-Out VSTi.
This is NOT for anyone who already knows how to do these things!
The zip includes a PDF file, a sample project, and a custom action and toolbar menu as mentioned in the PDF file.
Updated with revised PDF Dec 02, 2012
I hope it is helpful to people.