Just thinking some more about this...I am not sure it is as easy as it sounds..

afaik, when the CS is engaged on the keyboards that use it, it does record the notes played, but then when you select play, the CS then automatically drops you out of having the keybed control the chord input to the CS controlling chord input, and the reverse when stopping the CS.

Now as I see it, if an external CS (which is as Diki said - essentially just a midi note recorder and playback app) is used, where is the command, (which I suspect is sysex), to perform this same function.

Seems to me when using an external CS one would also need to tap the chord recognition zone tabs to off so the user can use the full keyboard without it generating chord data to the arranger engine.....although I guess it may not really be a biggie as most of the arrangers have a button of this sort on the panel and it is a easy and quick task to do.

Dennis