Hair pin swell
I'm wondering how I can make a swelling harpin like in the example below. 
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I'm wondering how I can make a swelling harpin like in the example below.
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Comments
You can head to the articulation section and hit more. The second option is a soft accent which perfectly resembles the picture. I hope this helps!
I think you want to use a crescendo hairpin followed by a diminuendo hairpin, both available (unsurprisingly) in the Dynamics palette.
On the whole note, if you don't care about playback, just attach them both to the whole note and adjust their lengths. If you do care about playback, add two tied half notes in Voice 2. Attach the crescendo hairpin to the first half note and the diminuendo hairpin to the second. Then make the half notes invisible and turn off Play.