On Sun, Apr 05, 2009 at 11:04:09PM +0200, Martin Tarenskeen wrote:
> diff -ur lilypond-2.13.0.orig/lily/midi-item.cc
> lilypond-2.13.0/lily/midi-item.cc
> --- lilypond-2.13.0.orig/lily/midi-item.cc 2009-04-05 21:11:25.000000000
> +0200
> +++ lilypond-2.13.0/lily/midi-item.cc 2009-04-05 21:17:43.000000000 +0200
> @@ -169,7 +169,8 @@
> Midi_note::Midi_note (Audio_note *a)
> {
> audio_ = a;
> - dynamic_byte_ = 0x7f;
> + dynamic_byte_ = 0x5a;
> + // dynamic_byte_ = 0x7f;
> }
In lily/midi-item.cc I saw this:
<quote>
Midi_note_off::Midi_note_off (Midi_note *n)
: Midi_note (n->audio_)
{
on_ = n;
channel_ = n->channel_;
// Anybody who hears any difference, or knows how this works?
// 0 should definitely be avoided, notes stick on some sound cards.
// 64 is supposed to be neutral
aftertouch_byte_ = 64;
}
<unquote>
I can try to answer the question in the // comment lines.
As I told you earlier, Midi Note Off message are not used very often in
the MIDI world. A more widely spread message is to use Midi Note On
messages with a velocity value=0 to end notes.
Note Off Velocity is something special. The idea is to registrate not
only how hard a key (I'm talking about a MIDI keyboard now) is hit, but
also how fast it is released at the end of a note. I have only once seen
a synthesizer that made use of this feature. It was an old AKAI
synthesizer that used Note Off Velocity to control the Envelope
Generator's release parameter of a Strings patch. In other words: If you
released the keys quickly, the sound would stop directly. If
you you released the keys slowly, the sound would fade-out
slowly after the key was released. It required some practicing to make
this work properly though. For most synths/soundcards/soundmodules
Note-Off is identical to Note-On with velocity=0.
I propose to change Lilypond's current behaviour to let it use Note-On
messages with velocity=0 instead of Note-Off messages with velocity=64.
I have attached a patch that changes this. The code can be even more
simplified I think. ( The Note-Off code is now identical to the Note-On
code, only the velocity value differs: 90=ON 00=OFF ). But I'm afraid to
break something if I change too much lines of code. Maybe someone else
who is more familiar with the code in mid-item.cc can think about it.
Patch attached for those who want to try.
--
Martin Tarenskeen
diff -ur lilypond-2.13.0.orig/lily/midi-item.cc
lilypond-2.13.0/lily/midi-item.cc
--- lilypond-2.13.0.orig/lily/midi-item.cc 2009-04-05 21:11:25.000000000
+0200
+++ lilypond-2.13.0/lily/midi-item.cc 2009-04-06 09:24:09.000000000 +0200
@@ -169,7 +169,8 @@
Midi_note::Midi_note (Audio_note *a)
{
audio_ = a;
- dynamic_byte_ = 0x7f;
+ dynamic_byte_ = 0x5a;
+ // dynamic_byte_ = 0x7f;
}
@@ -229,13 +230,14 @@
// 0 should definitely be avoided, notes stick on some sound cards.
// 64 is supposed to be neutral
- aftertouch_byte_ = 64;
+ // proposed patch: use note_on with velocity=0 instead of note_off
+ aftertouch_byte_ = 0;
}
string
Midi_note_off::to_string () const
{
- Byte status_byte = (char) (0x80 + channel_);
+ Byte status_byte = (char) (0x90 + channel_); //use note_on velocity=0
string str = ::to_string ((char)status_byte);
str += ::to_string ((char) (get_semitone_pitch () + Midi_note::c0_pitch_));
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