Hi guys!
Right now Ableton link acts as a master tempo for Cross DJ if you are using sync on both decks. So when using link you would need to adjust the tempo with the link + & - buttons, to the tempo of the track before hitting sync, this would adjust the tempo in all other Ableton link synced apps.
I tried MIDI mapping the controls in Cross but it didn't seem to work. You might be able to map them in Remixvideo and since link communication is two-way any BPM changes in one app will change the BPM in the other.
Unfortunately, right now that is the only way Ableton Link works in Cross DJ. I do think that it would be useful for a setting option, where Ableton Link can read the master deck BPM, instead of becoming the master deck and can bring it up with the team this week.
Syncing Remixvideo to Cross DJ with a live audio input is the easier way to get Remixvideo to sync to Cross DJs BPM. How to set this up will depend on what hardware you have and if you are using both programs on one machine or separate.
If you are using Remixvideo on a laptop and the audio is loud enough you can try using the built-in microphone as the input, as shown here:
Screen Shot 2018-04-07 at 10.13.47 AM.png
Let me know some more details about your setup and I can try and explain how to set everything up in the best way and help figure out any issues you might still be having.
Adam @Mixvibes