It appears that in order to edit a "melody" tone, that tone has to be in upper layer 1. I don't see an "edit" button on the tone screen in upper layer 2 or in lower levels 1 and 2. That would mean you have to select the tone to be edited by placing it in layer 1, edit it, save it as a new user tone, then select that new user tone in whatever layer you desire. If this is correct, then you can't really edit tones on the fly unless already in upper layer 1. Is this correct? Example- grand piano layer upper 1, electric piano upper 2- want to edit the electric piano quickly as you are playing and not necessarily need to save the edited tone.