i realized that this was a great function roland arrangers used to offer. even though i played only once such a keyboard (i only remember was looong time ago, i cant remember the model, except that was a roland) i think i could find a good use to it!
so, what do you think, would it be something useful for arranger players, or is something obsolete and not interesting anymore?
i thought this was a pretty innovative and helpful function for a live player...