Isn39;t exact hearing troubled by the ability not to do? It is the quiz which hears a sound source a chord, a continuous sound and applies the right note Since it can challenge according to difficulty, a favorite problem can be solved when you like beginners to an upper person. Please utilize for hearing and senseofpitch training The number of problems 100 questions Confirmed model of operation galaxy NEXUS SC04D GALAXY S II SC02 COptimus LTE L01D IS03 REGZA Phone T01C