Before you start writing music, you must specify the players that will play one or multiple instruments.
A player may be a solo player, which represents a single human being who can play one or more instruments. A clarinettist, for example, may double alto saxophone. A player may also be a sectional player, which represents multiple human beings, each of whom plays the same instrument. This could be, for example, a violin section or the soprano section of a choir.
Dorico uses this knowledge about players and their instruments to assist you in producing a practical score efficiently, for example by making it very easy to handle instrument doubling, divisi, and condensing music for multiple players onto a smaller number of staves.
If you add a player in Dorico, the following happens:
An instrumental part layout is created.
The player is added to any full score layouts that already exist. If no full score layouts exists, a new full score layout is created.
The player is included in all existing flows.