Except normalshapemediumseriesnormalshapemediumseries\musicsize which has to be explicitely changed if needed, all layour registers are reset to default values by normalshapemediumseriesnormalshapemediumseries\resetfacteurs which put zero dimensions into normalshapemediumseriesnormalshapemediumseries\staffbotmarg and normalshapemediumseriesnormalshapemediumseries\stafftopmarg, so that the next normalshapemediumseriesnormalshapemediumseries\debutmorceau will recompute them, unless they have been given non zero dimensions inbetween.