Fantastic and fun. I've improved so much faster than when I was just watching YouTube tutorials. Was able to easily connect to my keyboards USB midi interface, and it was responsive and quick to display on my phone when I played the keys on the keyboard. Just make sure you have the right USB cables and adapters for your keyboard or else this is probably useless on mobile.

Excellent tool, the app provide the MIDI files for the scales but not for the chords, if you want to learn to play fast you should lean the chords C, Am, F and G first, then try to play songs that have those chords, if you go the song way, every time you try to play/learn a song it will look like start all over again from the beginning, this is not a fault of the app but it would be nice to include the basic chords which actually are not copyrighted so the author won't have to pay any royalty.

since i couldnt find any daw app i could plug into that wasnt going to steal all my info, i settled for a digital keypad for recording stuff on another background audio recording app. this is pretty good, feels accurate, but the volume needs to be tripled. i can barely hear it at max, & my tablet speakers are great. would also be great if this could run in split screen. id be ok with only using 2 octaves at a time if i could run that recording app side by side, or reference images/notes.