Hi Franz, I see that you also posted the same question on https://lilypondforum.de/index.php/topic,1235.0.html and on https://www.facebook.com/groups/gnulilypond/permalink/10160756198283529/
It is usually considered polite not to post a question in several places at the same time, at least without waiting a bit for an answer in one of the places first, or to state explicitly that your question is cross-posted, so as to avoid people wasting their time answering a question that has already been answered elsewhere. Thanks and all the best, Jean
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