Short description of Absolute Fretboard Trainer 2.40: Training tool for guitar and bass players who want to know the fretboard of the instrument perfectly and effortlessly. Mastering the fretboard helps to play better, improvise, minimize errors and generally enjoy playing much more. AFT's interactive lessons and drills will help you know each and every note on the fretboard just like you know the open strings. You will end up knowing every note and position without thinking and without hesitation.