By default, single-note tremolos appear either on all notes in tie chains, or on all notes apart from the first or last note. Deleting tremolo strokes from tied notes removes tremolo strokes from all notes in tie chains.
In Dorico Pro, we use “tremolo with attack” and “tremolo with release” to refer to single-note tremolos that appear on all notes in tie chains apart from the first and last note, respectively.
In Dorico Pro, tremolos are considered measured by default, so the number of tremolo strokes shown is automatically adjusted on subsequent notes in tie chains as required. For example, if an eighth note with two tremolo strokes is tied to a quarter note, the quarter note has three tremolo strokes. This is because tremolo strokes function like beams, so two tremolo strokes and an eighth note stem flag is the equivalent of three tremolo strokes.
However, there might be circumstances in which you want all notes to have the same number of tremolo strokes, whatever their duration. You can also start tremolos partway through tie chains, or stop tremolos partway through tie chains.
You can change the number of tremolo strokes shown on individual notes independently in Engrave mode.