Q: Why does the MENU button on my XONE:DB2 flash when moving the Xfader?

A: The menu LED illuminates when the crossfader is moved to show that it is switched off.
(note LED is not illuminated when the crossfader is stationary in the X or Y position)

The x-fader can be turned on/off from the mixer’s menu, via MENU > XFADER SETUP.
Please refer to the Xone:DB2 User Guide for details