Sequel does include a large library of Instruments that can be triggered by MIDI. But it does not have the ability to send MIDI back out to an external sound module. So if you want to use the sounds from your keyboard, I'd recommend Cubase.
I'd suggest checking out the trial versions of Sequel: http://www.steinberg.net/en/products/se ... rsion.html
And Cubase Elements 7: http://www.steinberg.net/en/products/cubase/trial.html
The Cubase 7.5 trial would require an eLicenser USB key. I hope this information helps.