pitch blende

例句：

1. 1. The pitch blende is used to adjust the volume of different instruments.
   音调混合器用于调整不同乐器的音量。
2. 2. The engineer used the pitch blende to tune the piano.
   工程师使用音调混合器来调音钢琴。
3. 3. The pitch blende was a revolutionary tool in the early days of recording.
   音调混合器是录音初期的一项革命性工具。