Diki I tested it once around 2014 because VERY FEW arrangers being made at that time had Chord Sequencers, and you always emphasized how valuable they were! I also read about Ketron's "riff mode" and it sounded interesting. I had two arrangers stacked on an A-frame stand. I understood the basic mechanic of how a CS works so I thought "what the heck." If anyone is interested I can tell you that it works fine, just takes a little time to set up. [I also used my Yamaha for its animated "follow the bouncing ball" score display, because I didn't own an iPad at the time, and I've NEVER been able to turn the page in a book without being late or hitting a wrong note.] Sometimes two arrangers are better than one!

Eventually my two-keyboard setup gave way to a single Tyros 5 and the Roland BK-module. I never tried the stored chord progressions with this second-generation setup. My thoughts are like ^^John C's. When you start playing along with saved chord progressions, even if they're just sending notes to NTA, you're in a grey area between "live" and sequenced music. "Real-time" chord sequencers may be the greyest of grey areas, but generally I play all my one-finger chords live. So no I don't make regular use of the system I described.