The basic functions of the NN-XT are very similar to those of its sampler companion in the Reason rack - the NN-19. Just like the NN-19, NN-XT lets you load samples and create multi-sample patches by mapping samples across the keyboard. The sound can then be modified by a comprehensive set of synth-type parameters. There are however some major differences between the two. The NN-XT has:
Presets and samples from SoundFont banks can be loaded and used in the NN-XT.
This makes it possible to route different samples to different mixer channels for individual effect processing.
The possibility to create layered sounds.
This is done by mapping several samples across the same keyboard range.
The possibility to create sounds that only play over certain velocity ranges, velocity switched key maps and velocity crossfading.
Key maps with individual synth parameter settings for each sample.
Even though the NN-XT is a more advanced sample player than NN-19, it should not be considered as a successor to the NN-19, but rather as a complement to it. The NN-19 will for example probably still be the sampler of choice for those of you who want to be able to quickly load a couple of samples and start playing, since that particular aspect takes a little more doing with the NN-XT.