Apple ipod nano sixth gen 16gb User Guide

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Mono Audio
Mono Audio combines the sound of the left and right channels into a monaural signal 
that plays through both sides of your earphones. This enables users with a hearing 
impairment in one ear to hear both channels with the other ear.
To turn Mono Audio on or off:
 
1
  On the Home screen, tap Settings, and then tap General.
 
2
  Tap Accessibility.
 
3
  Tap the On/Off switch next to Mono Audio.
White on Black
Use White on Black to invert the colors on the iPod nano screen, which may  
make it easier to read. When White on Black is on, the screen looks like a  
photographic negative.
To turn White on Black on or off:
 
1
  On the Home screen, tap Settings, and then tap General.
 
2
   Tap Accessibility.
 
3
  Tap the On/Off switch next to White on Black.
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Chapter 10    
Accessibility