Video by Yamaha Global via YouTube
Source
Product Introduction | Harmony Director HD-300
The HD-300 is a powerful tool for music educators to more effectively teach intonation and rhythmic training to a musical ensemble.
Harmony Director can show quickly correct tempo and intonation which is difficult for directors to explain. Through listening sound from HD-300, players can learn their ear and rhythmic sense efficiently. HD-300 will support everybody’s performance to learn fundamental musical technics efficiently and to share the pleasure of music.
—————————————-
■Learn more about the HD-300: http://www.yamaha.com/2/hd-300