As a gift perfectly suited for Christmas, we have been working on a major update which will include a songbook of Christmas songs for the holidays. For each song, spectrals (buttons) will be preassigned and light up accordingly, to lead you easily through the piece. We are excited to enable quick caroling anytime.
It should be available within a week or two, once it has been approved by Apple.
We hope you enjoy it and share it with your friends.