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| From: | Bernard Hurley |
| Subject: | RE: two bugs (?) |
| Date: | Wed, 10 Jul 2002 17:43:42 +0100 |
The situation is a bit more complex than that. As far as I can recall (I wrote the embedded code for a midi interface many moons ago):
1) A midi channel can only have one instrument at a time assigned to it, but it is possible to change instruments.
2) A midi channel can be specified to be polyphonic, so that it can control a polyphonic synthesiser.
In theory, the midi spec allows you to do things like start a note, change instruments and start another note, chnage back to first instrument and stop its note then change to second instrument and stop second note all on one (polyphonic)channel.
Problems:
A) You need a synthesiser that can cope with this sort of complexity, many don't. Synthesisers on even good soundboards are rather basic.
B)If you do have such a synth, you would have to re-write the lilypond midi handling code to generate files like this.
Personlly it doesn't bother me too much as I only lilypond's midi facilities for proofreading purposes. I use Csound for writing electronic music.
Bernard
-----Original Message-----
From: Mats Bengtsson [mailto:address@hidden]
Sent: 10 July 2002 16:49
To: Simon Bailey
Cc: Mats Bengtsson; address@hidden
Subject: Re: two bugs (?)
> i've enclosed the midi file i get when i generate the score. i've also
> included an archive of the .ly files used.
>
> the midi output was working with timidity and my sound-card perfectly,
> until my score reached a certain size and amount of instruments. when i
> investigated which instruments were causing the problems, it was always
> different instuments that were having problems.
I haven't looked at the details of the MIDI format for
several years but from a quick look at the descriptions
at www.wotsit.org, it seems that you can only have 16
different channels in a MIDI file and each channel
corresponds to one instrument (and one Lilypond Staff
context). At the moment you have 18 different instruments.
It might help to reduce the number of staves for the
MIDI output to use only one for each kind of instrument
and let each part correspond to a separate voice.
This means you probably need a separate \score{} block
for the MIDI output.
/Mats
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