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drum-staff metronome click + bell ?

From: Silas S. Brown
Subject: drum-staff metronome click + bell ?
Date: Sat, 12 Dec 2020 20:52:58 +0000
User-agent: Mutt/1.5.21 (2010-09-15)

Hi, I'm trying to add a metronome 'click track' to a MIDI
that is to be played on a Casio CDP-130 which has a limited
range of instruments (it cannot do woodblock for example).

The General MIDI percussion standard maps "metronome click"
and "metronome bell" to key numbers 33 and 34 in channel 10,
but Lilypond's \drums does not seem to have any note commands
to produce these key numbers.  I can do: \drums { trim4 cl cl cl }
to use muted triangle and claves (which are available on the
CDP, as it uses them for button-press sounds), but this doesn't
sound as good as the CDP's built-in metronome sound which
uses key numbers 33 and 34.

I can make a separate Python script to go through Lilypond's MIDI
output and change key numbers 80 and 75 to 33 and 34 when on
channel 10, but it would be more convenient if Lilypond itself
could have the 'metronome click' and 'metronome bell' options
as part of what is available within \drums.  This should simply
be a matter of adding two new abbreviations and associating
them with the appropriate key numbers.  Would this be an
enhancement that can be added?  or is there even a way to
do it from the .ly file in Scheme?



Silas S. Brown

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