The default trill interval is a second, either major or minor depending on the context. In addition to specifying the interval when inputting trills with the ornaments popover, you can change the intervals of trills and existing trill intervals within their duration individually after they have been input.
Prerequisite
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The lower zone is shown.
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Properties is selected in the lower zone toolbar.
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If you are in Engrave mode, Graphic Editing is selected in the Engrave toolbox.
Procedure
Result
The interval of the selected trill intervals is changed. This applies from the selected trill intervals until the next interval change in the trill or the end of the trill, whichever comes first. For example, if you selected a trill with no interval changes within its duration, the interval is changed for the whole trill.
By default, trill intervals appear as accidentals when the interval is a second and as auxiliary notes for all other intervals. Signposts are shown at the position of each trill interval that does not require an accidental or auxiliary note. However, trill interval signposts are hidden by default.