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[ON]: The test tone is emitted from each speaker
in sequence while adjusting the level.
Adjust the sound level as follows.
1 Set the [TEST TONE] to [ON].
2 Press C/X/x/c repeatedly to select the
desired speaker and the level, then
press .
3 Repeat Step 2.
4 Press C/X/x/c to set [TEST TONE] to
[OFF] after adjusting the speaker level.