+@warning{
+The ending settings must be
+@emph{complete} rules. That is, every rule that should apply to
+the current time signature must be included in the setting.
+It is not possible to change the grouping of only one beam type
+for a given time signature. While this may seem cumbersome,
+it means that the current beaming settings need not be known
+in order to specify a new beaming pattern.}
+