Indeed (though technically you do of course get aural feedback, though if you're a beginning musician you might not be able to interpret it.) I'm not sure what

Indeed (though technically you do of course get aural feedback, though if you're a beginning musician you might not be able to interpret it.) I'm not sure what the interface will look like, but imagine the possibilities of displaying tablature along with musical notation along with what notes you're actually hitting, perhaps even with a photo of the desired hand position for a chord, all simultaneously (or easily accessible). Then, add training modes, (like guitar hero but with a full metronome range), technique exercises for scales/arpeggios, etc... and you have a powerful training system.