PlayScore 2 is designed to allow the musical director of a choir or ensemble to create practice resources for singers and players. Play-My-Part and Music-minus-one arrangements can be shared with others free. The director needs a subscription to make the practice scores, but the singers/players can play and interact with them free.
Your ensemble members should first download PlayScore 2 on their iOS, Android or Windows device. They won’t have to pay. When they get your email they tap on the attachment and choose Copy to PlayScore 2. They will then be able to interact with the music just as you did.
The group members you send the document to will be able to change tempo, use the count-in and metronome, and create loops. But if they are using the free app they won’t be able to change relative part volumes, transposition or instruments that you set for them.