I am having trouble using the Synthesizer V Studio VST3i plugin in Reaper. Hoping someone here can help me sort it out.

So first, here is how I work with the Synthesizer V Studio standalone program...
- open Synthesizer V Studio standalone program
- draw some notes
- press Play and I only get a tone for the notes
- then I go to the Voice tab, choose SOLARIA for Current database
- press Play and SOLARIA sings the notes beautifully

Next I try to use the Synthesizer V Studio VST3i plugin in Reaper...
- close the Synthesizer V Studio standalone program
- open Reaper
- insert Virtual Instrument on New Track
- choose VST3i Synthesizer V Studio plugin
- select No for Build Routing Confirmation
- draw some notes
- press Play in the Synth V plugin and I only get a tone for the notes
- then I go to the Voice tab, choose SOLARIA for Current database
- press Play and I still get tones for the notes! No SOLARIA singing!

Any ideas as to what might be wrong here? Thanks in advance for any help!