Re: force flat beam in piano staff that uses \autochange

[Nick Payne]

On 07/02/13 12:39, Michael Winter wrote:
> This does not work when there are groups of notes beamed together that 
> are either all in the upper staff or in the lower staff. I assume it 
> would only work if you could guarantee that all notes grouped under a 
> beam have notes in both the upper and lower staves.

Works here. The beams are flat regardless of which stave(s) the notes 
occupy. If you mean that you only want the beams forced flat where the 
notes occupy both staves, then decide which is more frequent (notes 
grouped on one stave or both), and use \once\override for the others. 
e.g. if kneed beams are more frequent:

\version "2.16.2"

nf = \once\override Beam #'damping = #1 % back to default

\new PianoStaff {
  \autochange {
    \relative c'' {
      \override Beam #'damping = #+inf.0
      b16 b b,, b
      b b b'' b
      \nf b cis d e
      b b b,, b
    }
  }
}

p.s. I tried using \once\revert Beam #'damping: no error was indicated 
but the \once is ignored...