Sony SRS-X99 Help Manual page 75

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Keep the removed grille on a flat surface to prevent distortion.
Note
Do not touch the exposed part of the speaker (speaker units) after removing the speaker grille.
What you can do with the speaker and remote control during playback
You can adjust the volume using the VOL (volume) –/+ buttons of the speaker or the VOLUME +/- buttons of the remote
control.
You can also use the MUTING button,
remote control.
Hint
After SongPal is downloaded and installed to your smartphone/iPhone, you can use it as a remote control.
Note
Sony is not responsible for any loss or damage to data in a USB flash drive that is connected to the speaker.
Do not disconnect a USB flash drive during operation. To prevent damage to data, stop playback, then turn off the
power of the speaker before disconnecting the device.
Sony does not guarantee correct operation when a USB hub or USB extension cable is used.
When you connect a USB flash drive, the speaker starts reading all the data stored on it. Reading files may take
some time.
Operation may become slow depending on the USB flash drive.
Related Topic
Parts and controls (Remote control)
Listening to music on a device via a USB connection (USB-A)
(Play/Pause) button, and
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/ (Previous/Next) button of the
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