EDIT: Cross DJ updated to v2.5

Here are the new features introduces on Cross DJ v2.5:

• Key detection function with classic or harmonic notation view above each deck
• Real Time manual or automatic key change, which can be matched to the key of the master track (the color then changes to white)
• Key-compatible tracks in the library are now highlighted in orange, even if your search is based on other criteria
• New Collection full screen view with mini-deck display
• Drag and drop tracks between players and samplers
• Marker display in the track master view
• Ability to assign multiple functions to a button
• New MIDI mappings for the Pioneer DDJ-SX, Numark 4Trak, N4 and Mixdeck Quad, Vestax Spin 2 and Native Instruments Kontrol S4 and X1 DJ controllers 

EDIT: The Pioneer DDJ-SX mapping includes the additional features:

• Full Dual Deck mode
• Samplers drive the players hot cues (and vice versa)
• Even when not in Dual Deck mode, samples in Pad Sampler mode can be driven from the Player decks
• Real time Bank Slicing: stays in the corresponding sampler even though a song is replaced in the player
• Also controls the MixVibes Video Plug-in

The update is free to existing users and can be downloaded from www.mixvibes.com.