A Music-minus-one score is a PlayScore 2 Playable Score with one part (usually the solo part) muted. Music-minus-one lets you practice your solo part to an accompaniment.
Tap the Staves icon bottom left
Locate the staff with your part and move the volume slider fully to the left
Tap Done
Instruments – you can enhance your score to use instruments (see Instruments and orchestration)
If your score has transposing instruments you can use the Auto-transpose feature (see Transposing instruments)
Count-in (Apple devices only) – If you need a little time to pick up your instrument, tap the icon 2nd from the left at the bottom and select a number of Count-in measures