A <note>-element containing a <chord/>- and a <staff>-element but no <voice>-element causes an additional empty staff above the defined one.
Tiny example:
missing_voice-element_in_a_chorded_note_leads_to_empty_second_staff.xml
Description: XML document
(unwanted) result:
<<inline: missing_voice-element_in_a_chorded_note_leads_to_empty_second_staff.png>>
The wrong MusicXML-markup was caused by Sibelius 7.0.0. In this case musicxml2ly puts the chorded note without a <voice>-element in an own voice (PartPOneVoiceNone) instead of placing the notes in a chord construct (< a' c''>1) in the same voice. She also surrounds the \context Staff block by an additional \new Staff block which causes the additional staff. musicxml2ly should be taught to be tolerant and automatically assign notes containing <chord/>-elements to the voice of the first note of the chord. (This first note does not contain a <chord/>-element.) hth patrick
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