Can a leader sing with members?

I’m a member of the Magnificat Chant Choir and we are planning to use this program ASAP… I’d like to know how the leader can also be included with the flock members to sing as well? If this concept works, we plan on using it every week for choir practice. All of us choir members live in different cities and meet each week at the church to sing in Mass on Sundays. Can someone help me? We have a very small choir and all of us need to be included to sing including the leader. Thank you in advance.