Hello Mogens, In fact the octaves in Lilypond are rather simple, as they more or less follow standard Helmholtz notation. So c (lilypond) = c(helmholtz), c' (L) = c' (H), c'' (L) = c'' (H), ... And for lower pitches you just need to substitute C(H) by c,(L), then CC(H) = C,(H) = c,,(L), CCC(H) = C,,(H) = c,,, (H) and so forth. Here I’m using parentheses to specify if the note is specified in Lilypond notation or in Helmholtz notation.
Cheers, Valentin
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