To truly appreciate this App, You need a ‘basic+’ grasp on reading “Standard Notation”
The “bass” sounds ‘tin-ish’ on play back! The dev’s could add options for different “tunings”, flats vs. rounds, even different string configurations (4, 5, 6-strings, etc.). The biggest plus (+) would be an option for adding ‘tablature’ with\without standard notation. The App is a Great service given forward to seasoned & aspiring bass players! The only thing, I implore you to do, is promote reading composition, at the least tablature for bassists, so they can grow as musicians!