problem with slash notation

[Paul Scott]

I am using the attached code provided by Amelie Zapf.

I get this error
programming error: round filled box vertical extent smaller than blot; 
decreasing blot (Continuing; cross thumbs)
programming error: round filled box vertical extent smaller than blot; 
decreasing blot (Continuing; cross thumbs)
programming error: round filled box vertical extent smaller than blot; 
decreasing blot (Continuing; cross thumbs)
programming error: round filled box vertical extent smaller than blot; 
decreasing blot (Continuing; cross thumbs)
programming error: round filled box vertical extent smaller than blot; 
decreasing blot (Continuing; cross thumbs)
programming error: round filled box vertical extent smaller than blot; 
decreasing blot (Continuing; cross thumbs)
programming error: round filled box vertical extent smaller than blot; 
decreasing blot (Continuing; cross thumbs)
programming error: round filled box vertical extent smaller than blot; 
decreasing blot (Continuing; cross thumbs)

and a short stem on each slash.

Any ideas?

TIA,

Paul Scott


sl = {
          \property Voice.NoteHead \override #'style = #'slash
          \property Voice.Stem \override #'length = #-1
}
nsl = {
         \property Voice.NoteHead \revert #'style
         \property Voice.Stem \revert #'length }

gtr = \notes\relative c'' {
    \sl b4 b b b
}
\score {
<<
    \context Staff = guitar \gtr
>>
}

slash.pdf
Description: Adobe PDF document