This device works according to Japanese and Anglo-Saxon ways: He does not know the notes Do, Re, Mi, Fa, Sol, La, Si ... It replaces them with letters of the alphabet. Worse, in their alphabetical order these letters do not even correspond to the usual order of the regular chromatic range of C, D, E, F, G, A, B, C ... Therefore, unless unnecessary sources of inevitable errors complications taste, it is better to dispense with this model. It is necessary to choose another, possibly from another brand, which are part of the notes C, D, E, F, G, A, B, C, known to all. It's simpler, more efficient and more enjoyable.