First of all, thanks for asking the question. For years I have wanted to revisit/update some of my old tunes and sketches by "putting them into softsynths." However, it was much easier to connect old gear and route the files to the hardware (the old-fashioned way I used to do in Dr. T's KCS, Cakewalk for MS-DOS, and later versions)--until I finally asked Google: "In SONAR X3, how do I send my midi files to SoftSynths" and I found this thread.
While all the background info on types of tracks, how to insert a softsynth, etc. is interesting, I just wanted something quick, without a lot of cutting-and-pasting, etc.
This is a wonderful answer:
"Give your MIDI track focus and then open up the inspector (Press " i "). Look down the bottom, just above the track name is the destination of that MIDI track. Click on the little down arrow and you should see a list of all your MIDI ports and loaded soft synths. Choose which ever soft synth you wish this MIDI track to drive."
THANK YOU!!!!
Steve