I love the app but I only wish one tiny thing which is that I would love to be able to change the sound of the instrument, like guitar, violin, brass, etc. You could still use the piano format but then just black out some of the notes that are inaccessible to those instruments. And then if identifying notes by piano format is too foreign for a player of a different instrument, then note names could be shown on the piano keys. I would pay more money to be able to do this! I want it so badly