In a few days, master should have reached the state where something like
\override Staff.MidiCC.7 = #100
would become possible for setting a MidiCC alist. I could see how to fudge
something similar into \set in general (likely without the revert and property
combining machinery of grob properties), or make the Performer_group pass along
actual override/revert commands.
However, I consider it prudent to _not_ use this as the user interface since it
does not lend itself to _continuous_ change of the continuous controllers. So
if we decide to make this roll via context properties, we still should provide
some wrapper commands as user interface.
---
** [issues:#4745] Add Staff.midiCC context property, refactor handling of MIDI
control changes**
**Status:** Started
**Created:** Sat Jan 16, 2016 06:01 PM UTC by H T LilyPond
**Last Updated:** Tue Feb 02, 2016 07:58 PM UTC
**Owner:** H T LilyPond
Add Staff.midiCC context property, refactor handling of MIDI control changes
Setting the Staff.midiCC context property to a list of (control number,
control value) pairs, where every control number and control value must
be an integer between the inclusive range from 0 to 127, will send the
corresponding raw control changes to the MIDI output on the MIDI channel
associated with the current context. For example,
\set Staff.midiCC = #'((7 . 100)) will set the MIDI volume control (#7)
to 100.
Most of the logic for handling MIDI control value initialization from
context properties (in Staff_performer::new_audio_staff),
changes (in
Midi_control_function_performer::announce_function_value_change), and
value conversion for output (in
Midi_control_function_value_change::to_string), was moved into the new
Midi_control_change_announcer class. All MIDI control changes are now
encoded using {Audio,Midi}_control_change items. This change makes the
old {Audio,Midi}_control_function_value_change classes obsolete.
http://codereview.appspot.com/284280043
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