Paul, Thanks so much. This is most helpful.
But in fact, the issue was far more subtle, and three days of debugging sorted it out. For future searchers of the mail archive, the following may be useful information. The snippet I posted worked fine in isolation and allows you to move notes arbitrarily, including over the top of each other. In the large score I am creating, the notes pushed each other away like mortal enemies. Eventually it transpired that this setting was causing that problem: \remove “Separating_line_group_engraver” This was turned on because the score uses proportional notation. Not removing this engraver allows the notes to be shifted wherever you like. I thought this was worth posting since it seems pretty subtle to me, and there is certainly no explicit documentation about this behaviour. Andrew
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