I would like to have four measures per staff (but more generally, how to control when to go to the next staff?). The following does not work, for two reasons: First, it inserts a mess of empty measures rather than putting music in the measures. Second, it would seem to require that I know in advance what argument to
supply to "unfold", but I am looking for a solution which will simply but four measures per staff without the necessity of me having to count measures...