The app is meant for piano players because you play on a virtual keyboard. You can set the musical range you want to train. 1 to 3 Octaves are possible. For better orientation the current range will be colored. Deeper or higher notes won't occur in the training. Promised! If you choose 'FREE PLAY', you can freely play notes on a virtual keyboard. You can see, how the equivalent note looks like and how it's called. If you choose 'TRAINING', a note will be presented for you in a score. Then it'