When should I use the [INT] button?

INT mode is for when you don't want to use control CDs/vinyl for DVS control.

Always use INT mode when using the DDJ-XP2 with a DJ controller (e.g.the DDJ-1000).

If you're using rekordbox dvs or Serato DVS with a DJ mixer, use REL mode. If you get some trouble with your turntable in a DVS setup and the stylus doesn't work well, you can switch REL to INT for stable performance.