Fiio X5 User Manual page 16

4)Adjusting the volume easily
While the screen is on, the volume control dialog will appear anytime the
volume up/down buttons are pressed or the OK buttons is held for one second.
When the volume control dialog appears you may adjust the volume stepwise
using the volume buttons or use the scroll wheel to change volume quickly. If
you would like to be able to change volume while the player is locked, set
Key-lock Settings (in System Settings) to Lockscreen 2 to keep the volume
buttons unlocked while the player is locked.
5)Turn on Resume mode to get back on the groove quickly
Under Play Settings, Resume mode controls the playback behaviour of the X5
when you turn it back on. Setting this to Last Song allows the player to start
playing again from the last song before the X5 was powered off while Last
Position even remembers where you were up to in the track you were playing.
6)How to set the Gain and realize gapless playback function
When using different headphones and earphones, the gain level may need to be
changed. For most earphones and efficient, low impedance headphones, we
recommend using low gain; for high impedance and / or low-sensitivity
headphones, we recommend using high gain.
Gapless playback means going from one music file to the next without a pause
in between. Enable gapless playback on the X5 by entering Play settings from
the main menu and setting the Gapless playback option to On. (Note: gapless
playback is not supported in shuffle and loop-single-song modes.)
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