Years ago I did have a part time duo with an Arranger kb muted drum track and live drummer & this was with a few different ones, ...it was a nightmare, too slow, too fast, behind the beat, fills were off, endings, etc, etc, ... even with a click track, ...no human can compete with the clock of an automated computerized arranger kb drummer as in an arranger keyboard it just doesn't sync correctly and there are always problems, I get douche`chills just thinking of those times YIKES!! ....now playing with a live percussionist with an arranger kb is great and works very well..