There are 2 possibilities to determine an upbeat. The first is mainly for newly written scores. Select the note or rest after the requested upbeat:
Choose:
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NtEd changes the begin such a way, that the selected chord or rest is the first member of the first full measure:
The 2nd procedure is mainly for scores with beginning rests. Select the note or rest which shall be the first element:
Choose:
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NtEd delets all before the selected element. Thus, the selected element becomes the first element.
The upbeat rules require to shorten the last measure by the upbeat duration. NtEd doesn't perform this automatically. To shorten the last measure mark all concerned rests in all voices as described in Select a block:
Choose:
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The appropriate rests become invisible:
See also: Hiding rests!