converts a following bu-letteral into a sumti representing the musical double sharp note with that name.
The next bu-letteral is absorbed and a double sharp accidental is given to it; e.g. "zi'e'i gy" means "the note G-double-sharp". For a different multiple of the sharp, use "zi'e'e" with a subscript instead. The first two syllables of the cmavo in the zi'e'a series were chosen for the similarity to "zgike". See also: zi'e'a, zi'e'e, zi'e'o and zi'e'u.