Re: [Denemo-devel] MIDI

[alex stone]

Jeremiah,

I'll have a think about what constitutes a "standard" set of midi
tools related to notation/playback/other, and send you chaps a list. I
will of course help in any way i can.

Alex.


On Wed, Aug 5, 2009 at 8:57 PM, Jeremiah
Benham<address@hidden> wrote:
>
>
>
>
> On Aug 5, 2009, at 10:08 AM, Richard Shann <address@hidden> wrote:
>
>> On Wed, 2009-08-05 at 06:37 -0500, Jeremiah Benham wrote:
>>>
>>> This sounds like a good idea. I think the things that people are going
>>> to want to control most are the following:
>>>
>>> pitch bend
>>> Crescendo/Decrescendo
>>> Panning
>>> Aftertouch/key pressure
>>> Mod Wheel
>>> sostenuto pedal press/release
>>> sustain pedal press/release
>>>
>>> Here is a chart showing these values:
>>>
>>> http://www.midi.org/techspecs/midimessages.php
>>>
>>> Does this help?
>>
>> I trust so, I don't have the bigger picture here - that page is just a
>> mass of columns with numbers and names to me. As an example, I was
>> assuming that the second thing you mention Crescendo would not be a MIDI
>> thing, but something done by a script deciding on the volume (velocity
>> in MIDI-speak) to go with each NOTEON message.
>
> You are correct.
>
>>
>> We urgently need someone who knows what MIDI output they want and how it
>> relates the the music notation + extra MIDI-attributes attached
>> to/between notes/chords/ at start of staff/voice/at start of score.
>
> It sounds like Alex can help you with that perhaps. I can try and help but
> all I wanted was volume control to implement dynamics with scripts. I think
> alex wanted more. I know how pitch bend works in the interface but I don't
> know what the midi messages look like. I don't have any time to with this
> right now and I am going on vacation tommorrow. I will be nlback on Tuesday.
>
> Jeremiah
>
>>
>>
>> So if Denemo has
>>
>> c' d' e' f'
>>
>> in the first measure, the MIDI generator will output (roughly)
>>
>> NOTEON notenumber-for-c' velocity
>> NOTEOFF notenumber-for-c' 0
>> NOTEON notenumber-for-d' velocity
>> NOTEOFF notenumber-for-d' 0
>> etc
>>
>> Now if someone wants something else in that MIDI stream they need to be
>> able to say what it is by looking up that table you quote. At which
>> point I can imagine that all sorts of complexities may arise, which we
>> need to sort out to make sure we can do it within the control mechanisms
>> in place. The example of a complexity that I mentioned, the one that
>> occurred to me overnight, was if you wanted a MIDI message attached to a
>> chord which goes out after the chord's NOTEOFF message. (Obviously,)You
>> can put a standalone MIDI message there:
>> (d-DirectivePut-standalone-midibytes "mytag" "the midi message bytes")
>>
>> but if you want it attached to the chord (so that it gets deleted with
>> the chord, etc) then we need a new override flag, else it will be
>> emitted at NOTEON. Channel switch was the case discussed on #denemo: you
>> can't attach a channel switch and switch back to a note without them
>> both ocurring at the same time -  you would have to put the switch back
>> as a standalone directive after the note. So this would need fixing.
>> Assuming channel switch is actually what people want. It doesn't occurr
>> in your list Jeremiah, so it may be that there are completely different
>> potential user groups involved here.
>>
>> I guess that other issues will arise with pitch bend etc, but I don't
>> know what relationship these things have with the music, beyond what the
>> name conjures up in my imagination.
>>
>> We don't need programmers for this, we need people who want to create
>> MIDI controls around the notes of a MIDI track. They know they want a
>> MIDI something and can look it up in that table, and tell us what they
>> want to insert.
>>
>> Later we can come to the user interface...
>>
>> Richard
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
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>
>
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