Hi,
I haven't a working solution, but some thoughts:
The \applyContext is one event in time, so you can set context-properties
*once*.
This might be a case for a midi-performer. This is an engraver inside the
midi-block, so it should be possible to create a scheme-performer to set the
midiExpression property inside the Staff context.
--- this is not an easier way! And I don't have a computer nearby right now, to
test, if moving the dynamic performer into another context helps.
Another approach might be a music-function, that produces SimultaneousMusic
with the note(s) and the dynamic midi events in separate streams. ( e.g. << {
\music } { \dynamicevents } >> )
Just some thoughts right now.
I am quite busy right now, so if there are no helpful answers within two weeks,
you can ask me again and I can provide some code.
Jan-Peter
Am 26. Juli 2016 00:51:49 MESZ, schrieb "H. S. Teoh" <[email protected]>:
>Hi,
>
>I have a Scheme function that returns a music expression.
>Unfortunately,
>the expression returned depends on the properties of the context it's
>evaluated in. I.e., based on the current setting of
>Staff.dynamicAbsoluteVolumeFunction it will return a different number
>of
>events in the music expression.
>
>Is this possible?
>
>The background of this is that I'm writing a Scheme function that
>generates single-note crescendos by emitting a series of \set
>Staff.midiExpression = ... events. Currently I've written a Scheme
>function that's able to generate these events; however, it requires me
>to specify numerical starting / ending values for midiExpression. I'd
>like to be able to specify dynamics instead of numerical values, and
>have the Scheme function automatically look up the numerical values
>based on the current volume function defined for the Staff.
>
>However, so far I haven't been able to figure out how to read the Staff
>properties except using \applyContext with a lambda, and AFAICT it's
>not
>possible to return a music expression from this lambda?
>
>Or is there another (hopefully simpler?) way to achieve what I want?
>
>
>--T
>
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