If for some reason X-Session Pro crashes, you may need to reset and reinitialize the controller to its factory settings. This is a two step process:
<First, turn off the unit. Use a bent paperclip or other small object to press and hold the Reset button (10) on the rear of the controller while you turn on the X-Session Pro. Once the unit is turned on, wait a moment, then release the button.
<Next, use the bent paperclip (or other small object) to press the A button (9) on the rear of the controller. Release
the button, wait 1-2 seconds, and press the Cue button 
located on the bottom right of the controller.
Your X-Session Pro is now reinitialized to its factory settings.
If the crossfader’s operation is “reversed” in your DJ software:
<X-Session Pro’s crossfader sends “normal” (CC#17, 0-127) and “inverted” (CC#20, 127-0) MIDI data at the same time. This feature is useful since it allows users to control two independent parameters, e.g. the volume of two different sequencer tracks, and blend from one to the other using only one hardware controller: the crossfader. If you assign X-Session Pro’s crossfader to control the crossfader in your DJ software, but its function is reversed (i.e., you slide X-Session Pro’s crossfader to the left but the on-screen crossfader moves to the right), go to www.m-audio.com and download M-Audio’s Enigma application.
<Enigma is a powerful program that allows you to change the settings of any slider, knob, or button found on X-Session Pro. Once you install and run the software, you will see a “virtual” X-Session Pro on-screen. Select preset 8 (Right CUE button) in Enigma, then double-click on the right half of the virtual X-Session Pro’s crossfader and set the
value for “Ctrl” to “255”. This will disable the transmission of “inverted” MIDI data from the crossfader. Upload the
changes to the X-Session Pro by pushing the 
button. Finally, push the button labeled “A” on X-Session Pro’s rear
panel. Release the button and within three seconds, push the right 
button on X-Session Pro. The crossfader will now only send “normal” MIDI information and no longer “inverted” values. Use your DJ application’s “Learn MIDI” feature to re-assign the crossfader within the software. This should resolve any reversed crossfader issues you may be experiencing.
Please see the Enigma documentation for more information.
X-Session Pro User Guide
