I've found by experiment that there's something missing from NR 1.3.3 Glissando in the paragraph about glissandoMap. This seems to imply that you need an entry for each note in a chord. But it's possible to leave out a gliss line entirely simply by omitting the relevant entry which is useful if two notes are the same. I suggest appending to the paragraph: 'Each glissando line is represented by an entry in the glissandoMap; unwanted lines are omitted.' And appending to the music example: \set glissandoMap = #'((1 . 2) (2 . 1)) <c f a>1\glissando | <c e c'> Regards,
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