Hi there,
Of course you can layer multiple sounds, and even more then were possible in the VI player :)
1) Use a dimension and control the selected slot via a dimension controller.
2) Use a dimension with enabled parallel mode to enable crossfading between the articulations
3) Use a dimension with enabled parallel mode and parallel mode set to "Mix" for each slot to simply play everything in parallel
4) Mix 2 and 3 to create some special articulations, for example sustained articulations in mix mode, in combination with short notes or dynamics. Now you can control the amount of accent / marcato vie the dimension controller.
Best, Ben