I have now had my new NS4 for 3 weeks. Thanks for a great instrument. It is, in my opinion, an exciting sequel to NS3. I have now transformed many of my NS3 programs to NS4 and had the opportunity to compare the sound differences thoroughly. There are two things I miss quite a lot.
I am missing some of the Nord Sample Library 3 sounds in version 4. They are simply better in version 3. Hope you will make it possible to convert from 3 to 4.
The other thing I miss is that reverb that has been generated, does NOT fade when you fade the sound on a section down. On my NS3 I can fade one section down and another in with the control pedal while playing without the reverb being affected. This helps to provide a nice and fluid transition between two sounds that replace each other.
On the NS4, reverb fades out when I fade a sound down while playing. Sliding transition of sounds is exactly Nord's trademark, so I assume that is a mistake

I very much hope that it can be fixed in your software, because I think that it is something that many NS3 users will miss the very fluid transition between the sounds.