No audio output when DDJ-WeGO4/DDJ-WeGO3 is connected.

Check the followings:

　-Isn't the PLAY/PAUSE button tapped to PAUSE?
　-Isn't the TEMPO -100%?
　-Aren't all the EQ knobs turned fully to the left?
-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.

When monitoring MASTER output
　-Check the MASTER LEVEL.
　-Check the CH FADER of the playing deck.
　-Is the CROSSFADER on the playing deck's side?

When monitoring PHONES output
　-Check the HEADPHONES LEVEL.
　-Is the HEADPHONES SELECT button turned on?

*When "Your device may not properly output audio using the connected controller.” is displayed in the version of Android 5.0.**
Please check the Audio Set-up Guide.
http://faq.pioneerdj.com/product.php?lang=en&p=WeDJ-for-Android&t=400