This app is part of the app "Tack: Metronome", available on Google Play at play.google.com/store/apps/details?id=xyz.zedler.patrick.tack. Tack is a modern metronome app for Android with a beautifully designed interface that has all the features you need for practicing a music piece accurate to the beat. With the song library feature you can save and arrange entire metronome configurations as parts of a song. Because this feature took months of hard work in my spare time, Tack lets you create 3 songs with at most 2 parts for free. With this unlock app installed, you'll get unlimited songs and countless song parts. In addition, you will support the development of Tack. Let's go, thank you in advance! Patrick Zedler You need at least Tack v5.0.0 for the unlock feature to work.