The Korg OT-12 Orchestral Chromatic Tuner has a smooth, stable VU meter and LCD display that are both angled for excellent visibility and operate in slow/medium/fast meter modes. The Korg OT-12 Tuner will transpose up to 12 notes for wind instruments and covers the range from AO-C8 with reference tones of C2-C7. Features a built-in microphone and selectable sound output level with 2 volume modes for small studios or large concert halls. Tuning modes include Auto, Manual, Sound Back, and Transpose. 8 modes of temperament cover every situation. The Sound Back mode lets you hear and see the correct tone and tune by ear and meter at the same time. The tone starts automatically when you play a note.