+
+ // Because "timing" can be switched on and off asynchronously with
+ // graces, measurePosition might get into strange settings of
+ // grace_part_. It does not actually make sense to have it diverge
+ // from the main timing. Updating the grace part outside of the
+ // actual check for "timing" looks strange and will lead to changes
+ // of grace_part_ even when timing is off. However, when timing is
+ // switched back on again, this will generally happen in an override
+ // that does _not_ in itself advance current_moment. So the whole
+ // timing advance logic will only get triggered while "timing" is
+ // still of. Maybe we should keep measurePosition.grace_part_
+ // constantly at zero anyway?
+
+ measposp.grace_part_ = now.grace_part_;
+
+