I tried using smartpropos and FMS to use my JR transmitter on my computer. I tried using a 3.5mm mono jack as stated in the website but what happens is that the calibration jumps all over the place.
In the end, what works was just the normal 3.5 mm stereo extension jack plugged into the LINE-In of my mobo soundcard. After calibration, works perfectly well.
Hope my experience will help those who are having problems with their Smartpropos software.