\version "2.12.3"

xxxivPitchNames = #`(
	(f . ,(ly:make-pitch -1 3 -1/6))
	(g . ,(ly:make-pitch -1 4 1/6))
)
#(ly:parser-set-note-names parser xxxivPitchNames)

\score
{
	\new Staff { g4 f }
	\midi { }
}