The except-voice element is used to specify a combination of slash notation and regular notation. Any note elements that are in voices specified by the except-voice elements are displayed in normal notation, in addition to the slash notation that is always displayed.
The
<except-voice>element.The except-voice element is used to specify a combination of slash notation and regular notation. Any note elements that are in voices specified by the except-voice elements are displayed in normal notation, in addition to the slash notation that is always displayed.
See
https://www.w3.org/2021/06/musicxml40/musicxml-reference/elements/except-voice/