Hello all, I have a piece of code that causes lilypond to say Drawing systems...lilypond: ../flower/include/drul-array.hh:35: T& Drul_array<T>::at(Direction) [with T = double]: Assertion `d == 1 || d == -1' failed. the code is as follows: \tuplet 3/2 4 { <b b'>8 { \change Staff = "upper" } cess'''8[ b] ass e ess d { \change Staff = "lower" } cess b ass e ess }
in the left hand of of the piano staff. The right hand has the same notes but one octave higher. Appreciate any help,greetings Samuel
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