Henni ... the recordings sound VERY good ...
I am not comparing the KBs, but my ancient technics kn1000 had a feature called Dynamic Accompaniment that did something similar in that it changed how the rhythm was played based on what the right hand was doing ... so if I were doing a more 'animated' solo in a song, the rhythm would become more animated as well ... unfortunately, they did not keep that feature in some of their later models ...