This is what would interest me as well. In the feature list the XP1 and XP2 has an asterix behind the 'free' on DVS.
It says it need 'the audio interface' for DVS. But your 900NXS2 is a kompatiple DVS audio interface. I got the same and want to know the answer as well....
Actually the XP1 / XP2 comes with a license for rekordbox DJ and DVS plus pack.
And therefore it should work....
Let's wait for PioneerDJ to comment.