IIRC, volume is controlled on per-note basis (attack and release; passed
as value parameter to each note on/off command), such that this approach
would not impose any problems. However, almost all other parameters, such
as pitch bend (important for tuning of micro tones), are channel messages,
such that restrictions apply when putting multiple voices into a single track.
Greetings,
Jürgen
On Fri, 15 Apr 2005, Mats Bengtsson wrote:
Stephen wrote:
Note also that these bugs have low priority among developers, since there
are
plans to rewrite the midi system from scratch.>
My comments can be taken two ways, as suggestions for a rewrite of
span-dynamic-performer.cc or as a wish-list for the new implementation. If
I where to contribute to the new implementation, I would need to start by
analysing the drawbacks of the current implementation of midi in Lilypond.
When it comes to things like this, I fail to see the distinction. We learn
from each other, hopefully.
One thing I want to do in midi is to say:
\remove Voice.Span_dynamic_performer
\consists PianoStaff.Span_dynamic_performer
to controll the scope of the dynamic changes, whether they only affect the
voice, the staff, the piano part, of the entire score. I don't know if that
is possible yet.
That will give technical problem, since each Staff context in the .ly
file will translate into one MIDI track (I hope I remember the correct
terminology here) and as far as I know, the dynamics are set per track
in MIDI. One solution is to redefine the MIDI contexts so that the
full PianoStaff is typeset in the same track. Technically, this means
that the PianoStaff context should be changed to be of type
"Staff_performer" and that the ordinary Staff context should have type
"Performer_group_performer". This is done with the following lines
in your .ly file:
\midi {
\tempo 4=60
\context {
\type "Staff_performer"
\name "PianoStaff"
\accepts Staff
\accepts DrumStaff
}
\context {
\type "Performer_group_performer"
\name Staff
\accepts Voice
\consists "Key_performer"
\consists "Tempo_performer"
\consists "Time_signature_performer"
}
Once you have done that, there's no need to move the Dynamic_performer
or Span_dynamic_performer, since any dynamic setting that will appear
within the same track will affect all the remaining notes in the track.
To see the original context definitions for the MIDI processing, see
the file ly/performer-init.ly
/Mats
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