No sound comes out when I am using my Android devce alone or when the DDJ-200 is connected.

Check the followings:
　-Check the Android device audio volume settings.
Is MUTE turned on?
　-Check the TRIM.
　-Aren't all the EQ knobs turned fully to the left?
　-Isn't the PLAY/PAUSE button tapped to PAUSE?
　-Isn't the TEMPO -100%?
-Check the TRIM. (*)
*TRIM is not shown in the default setting.
To display TRIM, turn on [Settings > General > Trim].
TRIM will be displayed on the performance panel.