Re: MIDI channels

[Graeme St.Clair]

> From a position of nearly complete ignorance - what if you wrote Staff{r} 
iso Staff{}?

GFStC.

-----Original Message----- 
From: Martin Tarenskeen
Sent: Tuesday, March 20, 2012 5:24 PM
To: lilypond-user mailinglist
Subject: Re: MIDI channels



On Tue, 20 Mar 2012, Frank Steinmetzger wrote:

> On Tue, Mar 20, 2012 at 09:11:20PM +0100, Martin Tarenskeen wrote:
>
> > Hi,
> > [...]
> > For this purpose I need to write a pianotune that uses MIDI channel 3 for
> > the Left Hand part, and MIDI channel 4 for the Right Hand part. A bit
> > strange, I agree, but this is what the PianoBooster docs tell me to do.
> >
> > Can Lilypond be tweaked to produce this? It needs to produce a readable
> > PDF as well as such a MIDI file.
>
> Well since Lilypond enumerates the MIDI channels as they are needed, you 
> could
> simply produce a MIDI score that has one empty staff, thus pushing the 
> other
> staves one channel down. (The first channel is used by lilypond itself).

That's one of the things I tried, but doesn't work.

I have discovered Lilypond only creates a new MIDI channel if a Staff 
contains
music.

For example I created a file miditest.ly:

\version "2.13.34"
\score {
  <<
    \new Staff {}
    \new Staff {}
    \new Staff { c' }
    \new Staff { c' }
  >>
  \midi {}
}

Then I called mftext (from abcMIDI toolkit) on the resulting miditest.mid 
file:

# mftext miditest.mid

And this shows:

Header format=1 ntrks=3 division=384
Track start
Time=0  Meta Text, type=0x03 (Sequence/Track Name)  leng=13
     Text = <control track>
Time=0  Meta Text, type=0x01 (Text Event)  leng=9
     Text = <creator: >
Time=0  Meta Text, type=0x01 (Text Event)  leng=30
     Text = <GNU LilyPond 2.15.34          >
Time=0  Time signature=4/4  MIDI-clocks/click=18 
32nd-notes/24-MIDI-clocks=8
Time=0  Tempo, microseconds-per-MIDI-quarter-note=1000000
Time=0  Meta event, end of track
Track end
Track start
Time=0  Note on, chan=1 pitch=60 vol=90
Time=384  Note on, chan=1 pitch=60 vol=0
Time=384  Meta event, end of track
Track end
Track start
Time=0  Note on, chan=2 pitch=60 vol=90
Time=384  Note on, chan=2 pitch=60 vol=0
Time=384  Meta event, end of track
Track end

--

MT


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