Yajia am59 can't adjust the volume.

Operation error, detailed operation is as follows:

1. Press the white key located at the upper right of the four white keys below the pipe (at the contact end of bending sound, you only need to put your thumb on the metal plate to influence bending sound, and the bending sound key is used to adjust the volume), and the volume data will be displayed on the screen.

2. Press the two transparent keys on the lens barrel side to adjust the volume.

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