Sony ERS-7M3 - Manual (Page 105)

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105
4
Touch the rear (red) back sensor.
The current setting is basic sound (voice sound, user sound).
To change to basic sound, touch blue. To change to voice
sound, touch orange. To change to user sound, touch red.
5
Touch the rear (red) back sensor.
(Music is heard while the change is being made.)
The setting is changed to User sound.
Within 10 seconds