Familiar with musical instrume app for iPhone and iPad

There are 8 instruments in the app, such as "banjo", "guitar", "drop D", "soprano ukulele", "7 string", "bass", "Mandolin", "baritone ukulele", which can help to understand the position of the tone in these instruments. It is a good app for learning musical instruments, Therefore, compared with other software, it can identify more music elements and restore music data, so compared with other software, it can identify more music elements and restore music data, hoping to give us more encouragement and suggestions and support us to improve.