The crossfader’s response is not so good.

Is the crossfader curve setting appropriate?

The crossfader curve setting can be changed in [Preferences] of rekordbox. For details, see rekordbox Operating Instructions.

rekordbox Operating Instructions can be checked on the support site of the rekordbox product site.

Also, the crossfader cut lag can be adjusted to any of 53 levels in [Preferences] of rekordbox. For details, see this unit’s Operating Instructions. The Operating Instructions can be checked on the support page.