Sony SRS-X99 Help Manual page 268

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,
control.
Hint
The procedure explained above is for guidance only. For details, refer to the operating instructions supplied with the
device.
The window above is an example of iOS8.
After SongPal is downloaded and installed to your iPhone, you can use your iPhone as a remote control to operate
devices connected to the speaker.
The volume level set by the VOL (volume) -/+ buttons of the speaker and that set in your iPhone/iPad/iPod touch are
synchronized.
Note
Loud sound may be output from the speaker if you set the volume too high by the iPhone/iPad/iPod touch.
In some cases, the volume level of the iPhone/iPad/iPod touch might not synchronize with the volume level of the
speaker.
Related Topic
Parts and controls (Remote control)
Using the BLUETOOTH/Network standby function
Listening to music on a device via a BLUETOOTH connection
(Play/Pause) button, or
4-567-508-11(1)
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/ (Previous/Next) button of the remote
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