Re: \after positioning in voices

[Jean Abou Samra]

> 
>       % \after 2 \< \after 8*7 \!\> \after 2 \!
>       s2 d8(c b2)


Make that

      s2 d8(\< c \after 8 \> b2) <>\!

\after doesn't work the way you indented your code suggests you
think it does. The syntax is

\after DURATION ARTICULATION MUSIC

and gives something roughly equivalent to

<< { s DURATION   <>ARTICULATION  } MUSIC >>

So when you do

\after 8*7 \!\>

it is telling LilyPond "put \> here and \! at 8*7 after it".
The first thing to correct is to change that into

\after 8*7 \! \after 8*7 \> ...

or just

\after 8*7 \> ...

(since \> automatically ends the previous hairpin).

But you still have the problem that you're using \after
to put an articulation at 8*7 after the s2, and the
skip that delays it to 8*7 makes the length of

\after 8*7 \> s2

be 8*7, not 2.

In short, \after doesn't just "spawn something in parallel
at a given point". It needs a main music argument to put
the articulation in parallel with, and normally you don't
want that main music argument (usually a note) to be
longer than the delay of the articulation.

I feel that's not a very clear explanation, but it's the
best I could do, sorry :(

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