Hi Bernie
The Receptor is basically a VSTi player, not a controller, therefore controls and applications are minimal because once set-up to your requirements via computer, you just plug it in and control it with your controller. (Think of it along the lines of the Ketron SD2)
To use VSTi as you want (No separate computer) then you only have 3 options, Neko, Lionstracs or Wersi.
The Wersi is the easiest to set-up and use, however the Lionstracs is more flexible, but you do need a reasonable amount of knowledge to set things up as you want. (Basically you have a choice of ease of use or flexibility with a fair amount of work involved)
The Neko is a completely different animal, as it is just a blank keyboard with a computer built in, so you have set everything up from scratch. (However this does mean you can really make it your own)
If your prepared to get down and dirty however, then the Receptor is a cracking VSTi player.
Regards

Bill