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GNU LilyPond-- -- |
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Setting automatic beam behaviorIn normal time signatures, automatic beams can start on any note but can
only end in a few positions within the measure: beams can end on a beat,
or at durations specified by the properties in
The value of \property Voice.autoBeamSettings \override #'(BE P Q N M) = dur \property Voice.autoBeamSettings \revert #'(BE P Q N M)Here, BE is the symbol begin or end . It determines
whether the rule applies to begin or end-points. The quantity
P/Q refers to the length of the beamed notes (and `*
* ' designates notes of any length), N/M refers to a time
signature (wildcards, `* * ' may be entered to designate all time
signatures).
For example, if you want automatic beams to end on every quarter note, you can use the following: \property Voice.autoBeamSettings \override #'(end * * * *) = #(ly:make-moment 1 4)Since the duration of a quarter note is 1/4 of a whole note, it is entered as (ly:make-moment 1 4) .
The same syntax can be used to specify beam starting points. In this example, automatic beams can only end on a dotted quarter note. \property Voice.autoBeamSettings \override #'(end * * * *) = #(ly:make-moment 3 8)In 4/4 time signature, this means that automatic beams could end only on 3/8 and on the fourth beat of the measure (after 3/4, that is 2 times 3/8 has passed within the measure). You can also restrict rules to specific time signatures. A rule that should only be applied in N/M time signature is formed by replacing the second asterisks by N and M. For example, a rule for 6/8 time exclusively looks like \property Voice.autoBeamSettings \override #'(begin * * 6 8) = ... If you want a rule to apply to certain types of beams, you can use the
first pair of asterisks. Beams are classified according to the shortest
note they contain. For a beam ending rule that only applies to beams
with 32nd notes (and no shorter notes), you would use If a score ends while an automatic beam has not been ended and is still accepting notes, this last beam will not be typeset at all. For melodies that have lyrics, you may want to switch off
automatic beaming. This is done by setting BUGS It is not possible to specify beaming parameters for beams with mixed durations, that differ from the beaming parameters of all separate durations, i.e., you'll have to specify manual beams to get: It is not possible to specify beaming parameters that act differently in different parts of a measure. This means that it is not possible to use automatic beaming in irregular meters such as 5/8 .
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