Re: Limited number of tracks

[Mats Bengtsson]

(Please always specify a Subject line in your emails.)

You don't have to dig into the C++ code. Since LilyPond is
so flexible, you can easily redefine the way the different
context types are mapped into MIDI tracks. See
http://mail.gnu.org/archive/html/lilypond-user/2003-01/msg00088.html
(which really addresses the opposite problem).

   /Mats


address@hidden wrote:
> Hi everybody!
>
> I've typeset the beggining of the 1st mvt of the 2nd Rachmaninov piano concerto.
> I'd like to listen to it with a midi player, but there are some problems with
> the instrumentation...
> Acutually there are more than 16 tracks. The problem is that the midi output
> sets one channel per track so it can't put more than 16 tracks even if some of
> them could use the same channel :((. I don't know if it's very clear...
>
> I look to the C++ code, an I'm guessing the problem comes from here:
> // from lily/performance.cc
>
> void
> Performance::output (Midi_stream& midi_stream)
> {
>  int tracks_i = audio_staffs_.size () + 1;
>
>  // ugh
>  int clocks_per_4_i = 384;
>
>  midi_stream << Midi_header (1, tracks_i, clocks_per_4_i);
>  output_header_track (midi_stream);
>  progress_indication ("\n");
>  progress_indication (_ ("Track ... "));
>  int channel = 0;
>  for (int i =0; i < audio_staffs_.size (); i++)
>    {
>      Audio_staff *s = audio_staffs_[i];
>      if (verbose_global_b)
>    progress_indication ("[" + to_string (i)) ;
>
>      /*
>    MIDI players tend to ignore instrument settings on
>    channel 10, the percussion channel by default.
>       */
>      if (channel == 9)
>     channel++;
>      if (s->channel_ < 0)
>     s->channel_ = channel;
>      s->output (midi_stream, channel++); // oooops!!
>      if (verbose_global_b)
>    progress_indication ("]");
>    }
> }
>
> I send the source if you want to test it...
> I'm using lilypond 1.7.27
>
> Thanks in advance for your help!
>
> PS: you have to run lilypond on the ts-score.ly file
>
>
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--
=============================================
        Mats Bengtsson
        Signal Processing
        Signals, Sensors and Systems
        Royal Institute of Technology
        SE-100 44  STOCKHOLM
        Sweden
        Phone: (+46) 8 790 8463                         
        Fax:   (+46) 8 790 7260
        Email: address@hidden
        WWW: http://www.s3.kth.se/~mabe
=============================================