Re: Problem with MIDI volume level

[Neil Puttock]

On 8 March 2011 09:34, Zoltan Selyem <address@hidden> wrote:
>
> %% Changes in volume affect all the staves in the MIDI output
> %% instead of affecting only the one they are written in.
> %%
> %% This went wrong between 2.13.52 and 2.13.53

>From 2.13.53, voices are mapped to MIDI channels instead of being
lumped together per-stave, but they must be named (i.e., \new Voice =
"name") otherwise they all go to channel 0.

There is however still an issue with your example even if you do name
the voices:

\version "2.13.53"

Upper = \relative c' {
 e8\ppp e e e e\fff e e e | e\ppp e e e e\fff e e e
}

Lower = \relative c' {
 c8\ppp c c c c c c c | c c c c c c c c
}

\score{
 \context StaffGroup
 <<
   \new Staff \new Voice = "1" \Upper
   \new Staff \new Voice = "2" \Lower
 >>
 \layout{}
 \midi{}
}

This still maps both voices to channel 0 since the mapping takes place
at the Staff level, resulting in two instantiations of
Staff_performer, each with a separate <context-id, channel> map.

Possible fix (not sure whether this is considered good coding style
though): in staff-performer.cc make map<string, int> channel_map_
static.

Cheers,
Neil