Note Detector can be used as a guitar tuner or a singing voice pitch trainer. I use it as an educational device. I have a bamboo flute laying aroung the house and I always wondered what notes came out when I blew on it. I`m not musically inclined enough to determine that kind of stuff with my ear. With Note Detector I was able to map out where all the notes on the flute were and how hard to blow in order to get an A instead of an A#.