Instruments changes are when a player holding multiple instruments switches from playing one instrument to a different instrument. They are usually indicated with text labels, both after the last note before the change and at the first note after the change.
Dorico Pro handles instrument changes automatically, including showing the appropriate instrument change labels, when the following criteria are met:
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You have added a single player holding at least two instruments.
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You have input notes on at least two instrument staves held by the single player, such as inputting oboe notes on the Oboe staff and cor anglais notes on the Cor Anglais staff.
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Notes for different instruments held by the same single player do not overlap.
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Instrument changes are allowed in the layout.
You can see staves for all instruments in galley view, and you can allow/disallow instrument changes in each layout independently.
By default, instrument changes occur after the last note in old instruments, instrument change labels for new instruments appear after cues on their staves, and instrument change warnings are hidden in full score layouts. However, for quick instrument changes with a short duration between old/new instruments, Dorico Pro shows only one marking, either the label or the warning.
You can change the positions of instrument changes and instrument change labels in each layout independently.
Instrument change labels use the appropriate prefix for the current instrument name language setting.
You can change the default positions of all instrument change labels project-wide relative to staves and other items on the Instrument Changes page in Engraving Options.