Tremolos are represented in **kern by encoding the individual notes
in the tremolo within a single beam group, and then adding a
*tremolo tandem interpretation before the beamed notes that should
be converted into a tremolo.
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Use *Xtremolo to turn off tremolo conversion of beamed notes:
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When *tremolo is active, only beamed groups that can convert into tremolos
will be converted into tremolos. Other patterns of beamed notes will remain
unaffected.
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Tremolos also work with beamed chord notes
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Fingered tremolos
The *tremolo interpretation can also reduce alternating notes into
tremolos:
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Two-note tremolos also work with chords:
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Unmeasured tremolos
Unmeasured tremolos are not expected to be played exactly as written, and function more as ornaments. Thirty-second note tremolos are often unmeasured tremolos, and can be encoded in the following alternate way.
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The number of tremolo lines is indicated by the repetition of the letter O
in the token.
The line:
!!!RDF**kern: O = tremolo
defines the O character in **kern data to represent a tremolo.
O is the upper case letter o which means a generic ornament in
**kern data. Other user signifiers could be used as well, but
using O is useful if you want to categorize the tremolo as an
ornament like a trill.
Disabling tremolos
Tremolos can be disabled from notation rendering by using the shed filter. Add the following line to a file to temporarily disable tremolos:
!!!filter: shed -e 's/^X?tremolo$//I'
This filter changes both *tremolo and *Xtremolo interpretations to the
null interpretation, *.
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To preserve the tremolo interpretations within the data for later reconstruction of tremolos, use instead something like:
!!!filter: shed -e 's/^(X?tremolo)$/$1-disabled/I'
Here is the compiled output of this filter:
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To restore the tremolos again, use this filter:
!!!filter: shed -e 's/^(X?tremolo)-disabled$/$1/I'
Tremolo filter
The tremolo filter can be used to add tremolo notes to a Humdrum
score that does not have expanded tremolos. To expand a single
note into a tremolo, add the duration of the tremolo surrounded by
@ markers after the note token(s):
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Scores should not be stored in compressed tremolo format, as the
@ encoding is only intended to add tremolos to the score using
the tremolo filter. Here is the result of compiling the filter:
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Two-note tremolos are encoded in a similar manner. Place the
duration for the tremolo only on the first note of a two-note pair,
surrounded with two @@ characters rather than one. Each note of
the pair should posses one-half of the total duration of the tremolo.
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The result of compiling the filter:
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