1. The five instruments you can choose from are piano, guitar, electric guitar, violin, and brass.
2. The four percussion choices are drums, tambourine, maracas, and triangle.
3. The fastest tempo you can choose is 180 BPM.
4. The slowest tempo you can choose is 45 BPM.
5. In Settings, you can change the key, scale, and time signature of the song.
6. To erase a note or beat, you can simply click on the note or beat and press the delete button.
7. To start a new song, you can click on the "New Song" button on the app.
8. To save your work, you can click on the "Save" button and choose a file name to save it on your device.