- **Patch**: review --> countdown
- **Comment**:

Patch on countdown for Jan 24th.



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** [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:** Mon Jan 18, 2016 01:37 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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