Xlv, xvol, xdir

[Open_Mike]

It employs a parameter modulation curve instead of just linear… The manual goes on to say:

This way of locking volumes is suitable when wanting to avoid the volume dip that otherwise would occur when the crossfader is used to fade between two tracks and reaches the center position.

You want both tracks to have the curve for the desired effect…
Elektron wouldn’t just throw in 3 useless parameters…