Thank you Fran for posting and explaining.

I would like to add though that all of this can be done ( and more) with virtually every current arranger keyboard. I can do so with my Ketron SD7 but even with my old Korg PA50sd. And instead of using your Roland souncard any two way ( or even better four way) soundcard can do the trick, e.g. the STeinberg UR22 or the Behringer, etc. ) I myself use the Behringer U-Phoria UMC404 which handles four audio channels simultaneously as well as full MIDI and comes really cheap. just over 100 euros here in Europe). The audio quality is just very slightly less than the Steinberg interface imho but amply sufficient and very good.
And of course I also use Mixcraft 9 Pro as my DAW which is a fantastic program and even includes a bunch of VSTs itself as you well know. So basically what you are describing depends less on the keyboard ( assuming it is at least motl or better still totl) than on the soundcard and DAW that one uses.........I think.....

regards,
John