MuseScore is capable of playing back a score using swung eighth notes or swung sixteenth notes.
Set up swing
The recommended way to inform MuseScore (and the humans who will read your music) that a swing feel is intended is to create a Swing System Text element.
- Click the first note
Double-click Swing in the Text palette
Return to straight rhythm
If you have a score containing both "swing" and "straight" sections, and want this reflected in playback:
- Insert a Swing text item as explained above, attached to the first note or rest of the "straight" section.
- Change the text as desired—double-click on the item you just inserted and change it to "Straight" (see Text editing).
- Turn swing off via right-click → System Text Properties… → Swing Settings → off
Swing text settings
Swing settings for an individual Swing text marking are available via right-click → System Text Properties… → Swing Settings. This allows you to define how heavily to swing (i.e., the ratio of the downbeat to upbeat), and whether it's the eighth note or the sixteenth note that is swung.
Global swing settings
By default, in the absence of a Swing text element, swing playback is turned off. To turn on swing playback without adding a text element, use the general (score-wide) swing settings in Style → General... → Score.