Dan, if you do a search for Chord Sequencer here, most of the posts that come up will be mine! It's a Roland feature they have dropped since the G1000, and no, it's not a step recorder for chords (well, in a way it is!) but something that just records your chords WHILE YOU ARE PLAYING, and can loop them on the fly, without interrupting normal play.
You can record just the chords, or record the chords AND the fill and variation changes, but my favorite was just the chords, then you could repeat the section, but have the variation and fills different each time around.
The simplest way to use it would be to start your arranger, have it play the intro, then during the bar before the intro ends, you hit Record on the CSeq. Now play the first verse and chorus of a tune, and in the bar before the end of the chorus hit Play on the Cseq.
Now the entire verse and chorus chords (which are likely to be the same!) get played for you, but you still have fill and variation control so it isn't repetitive. Now you can switch off chord recognition, and concentrate on playing normally, with two hands (gasp, what a concept!), while the chord input gets done for you.
The icing on the cake is that at any time, you can switch the Cseq off, play a bridge or vamp, whatever, and then hit Play on the CSeq and start your loop again. ALL without ever interrupting the beat. You can even change styles or registrations while the chords keep getting played.
It is the perfect combination of true, free-form arranger play, and the rigid structure of SMFs. It allows you to concentrate on your solos, where you can be a LOT freer with the bender, or two handed techniques, without being tied to the necessity of HAVING to play the chords 24/7, no matter that they are exactly the same as you played in the first verse and chorus.
For the life of me, I still don't understand why this feature isn't on each and every arranger out there. It was the most practical addition to an arranger ever made, and very simple to implement. Roland got it perfect over 15 years ago, but few realized it's usefulness.
Oh well....... Next year in Jerusalem, eh?
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An arranger is just a tool. What matters is what you build with it..!