Thanks for the rundown -- for anyone reading, I found these options under WDM 'Audio Routing' in the YSFW Driver control panel, under Output -> Ports....

I apologize for my sub-par job in demonstrating what I am finding confusing. When I check 'Listen to this device' in the Windows settings, the micr...

After trying the standalone Editor, I can confirm that the problem lies with Reaper. I now see 'Motif XS8 Main' pre-selected under MIDI Out, as well a...

I have Yamaha Steinberg FW Driver V1.6.6, and I am running Windows 10. Also, the VST is v1.6.4.