This unique and simple vocal recorder has metronome as well as a holding note to help you sing and record your songs. Here are all the features of the app: Time Signature: 4/4. 3/4. 5/4. 7/4. Tempo: 70 - 280. Scales: G, G#, A, A#, B, C, C#, D, D#, E, F, F#. Recorded Audio Format: AAC. Note: Please use the mobile's headphone to record for best results.