Motorola EM30 クイック設定ガイド

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music
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adjust audio settings
You can adjust audio settings to optimize the sound 
quality when listening to music through the phone 
speaker, stereo headphones, or stereo headset.
To change playback volume, press the volume keys 
on the side of your phone.
To change the equalizer setting, press Options > Setup >
Equalizer > equalizer effect.
To set bass boost, press Options > Setup > Bass Boost >
bass level. (The equalizer must be turned off to use 
this feature.)
To set stereo separation, press Options > Setup > 3D Stereo >
separation level.
Note: 
The equalizer and stereo effect settings are best 
experienced using a 3.5 mm wired headset or stereo 
headphones. Your phone cannot produce stereo effects 
through the built-in monaural speaker.