The fader should be mapped automatically. I would remove the current MIDI mapping that you've applied and check that: 1) Crossfading is enabled in Serato Video. You’ll want to check that it’s working in Serato Video. If it’s not working there, then the signal won’t automatically be sent through to MixEmergency. 2) You’ve enabled the crossfader in MixEmergency. Check out the manual, here: http://www.inklen.com/mixemergency/manual/controlwindow/ You will noticed, under the Transition View section there is a button, labelled #8 that is enabled. Make sure this button is enabled on MixEmergency’s Control window. 3) You’ve enabled the crossfader in MixEmergency’s Preferences. In MixEmergency, go to the Preferences, then check that “Use External Controller Crossfader” is enabled in the Transition section.