Hello,
You can slide notes using the "glide" feature that makes sounds slidebetween the notes you play if they overlap.
Glide speed can be modified.
The preenfm3 is MPE compatible (I still have to uploade my video on this).
And with MPE enabled, sliding notes is part of the protocol. On many notes at the same time.
You need a compatible keyboard.
I used "KB-1" on the ipad for that.