Jean-Patrick:
For instance, I want to ensure that the eighth-note rest (half-rest) for a specific instrument always snaps to a chosen line (like the Bass Drum line) by default, rather than floating based on other voices.
This Notation Option could maybe help you (no manual spacing here)
Jean-Patrick:
I want it to be audible during playback, but I need it to be completely hidden on the staff without affecting the spacing or the layout of the other instruments.
I want to make sure that hiding these notes doesn’t create gaps in the rhythmic spacing of the other voices.
Hiding noteheads/stems/ledger lines in Engrave Mode shouldn’t affect the horizontal spacing. As for the rests, I explained here how to hide them without changing the spacing:
However, removing rests can sometimes change the horizontal spacing depending on the other notes in the bar. If you don’t want the spacing to change, select the rests and, instead of removing them: in the Properties panel, set their color to transparent (Alpha Channel 0 on Windows).
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