Re: midiPanPosition in midi context block

[David Kastrup]

Matt Wallis <address@hidden> writes:

> But it doesn't work if I try to set the midiPanPosition inside a midi
> context block like this:
>
> \version "2.19.83"
>
> \include "english.ly"
> sopStaff = \new Staff = "sop" {
>   \relative c' { e4 f g a }
> }
> altoStaff = \new Staff = "alto" {
>   \relative c' { c4 d e f }
> }
> \score {
>   <<
>     \sopStaff
>     \altoStaff
>   >>
>   \midi {
>     \context Staff = "sop" {
>       \set Staff.midiPanPosition = #1.0
>       \set Staff.midiBalance = #1.0
>     }
>     \context Staff = "alto" {
>       \set Staff.midiPanPosition = #-1.0
>       \set Staff.midiBalance = #-1.0
>     }
>   }
> }

This is terrible.  Really, really terrible.  \context Staff = "xxx"
should never be allowed in an output block since setting name-specific
context defs is not supported and does not make sense, either.  I'll see
whether I can stop the parser from accepting this abomination.
>
> Furthermore, the result of doing this is that both staffs are played
> through the left, and nothing on the right.
>
> Am I doing something wrong?

As a rule, changing syntax until something passes the parser instead of
working from documented syntax and examples is a bad idea.  Most of the
time, you'll trigger error messages pinpointing the problem.

But sometimes there are oversights.

> I want to do the setting in the midi context block because I require
> different pan positions for a staff depending on which score it
> appears in.

Then create different variables/expressions for that purpose.  But the
\midi block cannot sensibly differentiate between differently named
contexts.

-- 
David Kastrup