I have the S3 and according to NI "Performing with stems is supported by all Traktor controllers" I am not sure this is ACCURATE. To activate stems all tutorials say right-click on the music file and select GENERATE. I do not have this option when right-clicking music files I am using the demo version (try before buying). Additionally, I don't see the Patter Player or Maximiser. So are these features not included in the demo or do they just not work with the S3?