Half doubling
gracing technique (in order of complexity / frequency): b3
Doublings from a² and g², missing the g² gracenotes; The example, taken from Logan again, starts on a², the target note descending from g²-g¹:
a²-f²-g²; a²-f²-g²-f²; a²-e²-f²-e²; a²-d²-e²-d²; a²-c²-d²-c²; a²-b¹-d²-b¹; a²-a¹-d²-a¹; a²-g¹-d²-g¹.
NB: Example(s) to be replaced with staff-notation.
Logan, [?]: Complete tutor for the Highland bagpipe [London, [1936?]]. Entirely revised by captain John MacLellan… London, s.a. [ca. 1980], p.XIII.