【Recording method for one-person-duet】 1. Practice the treble part and bass part of this piece by yourself 2. Record the part that is played first, e.g., this piece, the treble part comes out first, so record the treble part first. 3. Use earphones to listen to the recorded part, and at the same time use another iPhone or iPAD to listen and record the second part. 4. After the two videos are recorded separately, they will be synthesized in iMovie. 5. When combining two videos, the audio in the two videos must be aligned according to the score, and the volume of the two parts should be adjusted appropriately. 【一人四手联弹录制方法】 1. 自己分别练熟这首曲子的高音部和低音部 2. 录制先演奏的那个音部，比如这首曲子，高音部先出第一个音，所以先录高音部。 3. 用耳机戴着听录制好的那个音部，同时用另一个手机或iPAD边听边录第二个音部。 4. 两个视频分别录制完毕后，在iMovie中合成。 5. 合成的时候两个视频叠加，两个视频中的音频必须根据乐谱对齐，适当调整两个音部的音量。 ... https://www.youtube.com/watch?v=wzBbhi9sQ34