Well that sounds pretty much like a Chord Track, then. If you can edit it, then get it to generate a new accompaniment sequence after editing, I think that's what arranger-yes-pc-no wants.

Mind you, I think his insistence on staying away from the computer radically restricts what he can do if he is into song creation. Programs like Ableton Live take the looper/synth/DAW into areas that even the Korg Chord Looper can't even come close to touching. I am just not sure why some are so technophobic about computers on the one hand, yet determined to do basically the same thing on a hardware keyboard that makes the exact same task 100 times harder...