Quick Era Lookup （钢琴年代快速查询…1.）Steinway（施坦威）C.BECHSTEIN（贝希斯坦）Yamaha（雅马哈）Kawai（卡哇伊）Boston（波士顿）Baldwin（鲍德溫）… – New York Piano Tuner : I used ear tuning (also known as auditory tuning) and state-of-the-art software-based electronic tuning equipment for sound tuning. (The frequency for home concert tuning is 440 Hz.) 我采用耳调音法（也称听调音法）和最先进的基于软件的电子调音设备进行调音。（家用音乐会调音的频率为 440 Hz） Chen YN 调音主页