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my video and mixer crossfader are not corresponding please advice
That's no good. Have you connected the mixer to your computer via a MIDI hub?
If so, were you also able to map the mixer's crossfader (via MIDI) to MixEmergency's crossfader?
I used a DMG 800 and MIDI to use mixemergency all the time. Its particular to certain midi usb adapters. And remember to turn the midi to ON at the top of the mixer.