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Re: Strange problem with guitar bends


From: Martyn Quick
Subject: Re: Strange problem with guitar bends
Date: Thu, 31 Jul 2014 20:26:49 +0100

Thanks for the suggestion - I was actually aware of the use of \shape to adjust the slur, but hadn't implemented it since I thought it more sensible (perhaps naively) to get all the notes in place and then adjust the slurs at the end of the process.

However, for me introducing this doesn't fix the problem.  I still get the same error when I use the following code:

\version "2.18.2"

\include "definitions.ily"

\language "english"

\layout {
  \context {
    \Staff
    \override VerticalAxisGroup #'default-staff-staff-spacing =
    #'((padding . 4))
  }
}

music = {
  \set restrainOpenStrings = ##t
  \set TabStaff.minimumFret = #12
  \relative a' {
    r2 c16 ( \glissando b )
    \bendOn \bendGrace g' ( a8 ) ( \bendGrace g ) ( a ) \bendGrace g ( a ) |
    \bendGrace g ( a4 ) \bendGrace \preBendHold g ( a16 ) ( g8 )
    \bendGrace g ( \holdBend a16 ) ~ a8 ( g16 ) e
    d ( e ) g \bendGrace \preBendHold d ( e ) ( |
    d8 \bendOff
    \shape #'((0 . 0) (0.6 . 0.3) (1.2 . 0.3) (1.8 . 0)) Voice.Slur
    \shape #'((0 . 0) (0.7 . 0.3) (1.4 . 0.3) (2.1 . 0.3)) TabVoice.Slur
    c16 ( \hideNotes \grace d ) \unHideNotes
    \bendOn d ( e ) g \bendGrace \preBendHold d ( e ) ( d )
    c4 \bendGrace \preBendHold a ( c16 ) ( a )
    \bendOff
    \shape #'((0 . 0) (0.6 . 0.3) (1.2 . 0.3) (1.8 . 0)) Voice.Slur
    \shape #'((0 . 0) (0.7 . 0.3) (1.4 . 0.3) (2.1 . 0.3)) TabVoice.Slur
    g ( \hideNotes \grace a ) \unHideNotes \bendOn a ( |
    c8 )
  }
}

\score {

  <<

    \new Staff {
      \clef "treble_8"
      \key a \minor \numericTimeSignature \time 4/4
      \tempo 4 = 58
      \music
    }

    \new TabStaff {
      \clef moderntab
      \music
    }

  >>

}


From: Federico Bruni <address@hidden>
To: Martyn Quick <address@hidden>
Cc: "address@hidden" <address@hidden>
Sent: Thursday, 31 July 2014, 14:38
Subject: Re: Strange problem with guitar bends

2014-07-31 12:49 GMT+02:00 Federico Bruni <address@hidden>:

2014-07-31 9:56 GMT+02:00 Martyn Quick <address@hidden>:

The \hideNotes and \unHideNotes is to achieve the work-around for mixing bending strings with hammer-on and pull-offs (which are engraved using normal slurs).  This is just an excerpt of what I was trying to engrave... and I think it is minimal, in the sense that if you remove any one part of it then Lilypond runs fine and produces what I expected.


Ok, then I would write the last lines this way (this avoids the error, by the way):

\bendOff
\shape #'((-0.8 . 0.5) (-0.8 . 0.5) (-0.8 . 0.5) (-0.8 . 1)) Voice.Slur
\shape #'((-0.3 . 0) (-0.3 . 0) (-0.3 . 0) (-0.5 . 0.5)) TabVoice.Slur
\hideNotes \grace a( \unHideNotes g )

Adjust the values of \shape


And this is a full example of the workaround. I might add it to the README on Github:

\version "2.18.0"
\include "notation-snippets/guitar-string-bending/definitions.ily"

music = \relative c' {
  \set TabStaff.minimumFret = 4
  \set TabStaff.restrainOpenStrings = ##t
  \bendOn 
  fis8( g)( fis) \bendOff
  \shape #'((-0.8 . 0.5) (-0.8 . 0.5) (-0.8 . 0.5) (-0.8 . 1)) Voice.Slur
  \shape #'((-0.5 . 0) (-0.5 . 0) (-0.5 . 0) (-0.5 . 0.3)) TabVoice.Slur
  \hideNotes \grace fis( \unHideNotes e)
}

\score {
  \new StaffGroup <<
    \new Staff { \new Voice { \clef "treble_8" \music } }
    \new TabStaff { \new TabVoice { \clef "moderntab" \music } }
  >>
  \layout {
    indent = #0
    \context { \StaffGroup \override StaffGrouper.staff-staff-spacing.padding = #3 }
  }
}




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