Please download this to use for routing reaper thru to riffworks.
http://stash.reaper.fm/1358/ReaRoute.RPPRead all of this before you start. Print it out.
1. Make sure you install Reaper with ReaRoute checked.
2. Open Riffworks and set the driver in audio setup to ReaRoute ASIO.
3. Set the RW input to ReaRoute 1/2(Out should be at 1/2 by default).
4. Go to ReaRouted Instrument track. There should already be ReaInsert plug there.
Set both the sends and returns to 1 and 2. Place your VSTi on the MIDI track.
On the track it is enabled to record output turn that off that is only for recording output to a reaper track.
5. Make sure that when you start a session to do this you open reaper first so it is not used as a rewire client. Then open RW.
6. You can use this with any of the rewire clients that open in Reaper. Remember you are only recording audio with this setup!!!! No MIDI