
Concerning the calibration of the crossfader on your One MKII, ensure that you have the One MKII Mac Driver installed, as it includes the Calibrate Option.
Once you have installed it on your Mac, please look for Rane ONE MKII, and you should find the following application.

Click to access the Control Panel, and you will see the following window. Make sure your ONE MKII is connected to your computer and turned on, but do not open Serato right now, as this will cause the calibration to fail.

Select the Calibrate Crossfader button and adhere to the instructions displayed on the screen. A notification will be sent to you once the calibration is successfully completed.
Once the calibration is finished, please check to see if the fader is functioning with less dead space.
If you have any questions, or require any additional assistance, please contact our support team HERE.
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