These CDs have the Serato NoiseMap™ Control Tone which allows Serato DJ or Scratch Live to track the motion of the CD in the player, simulating the same movement with digital audio. Since CDs can be lost or scratched, it is smart to have a couple spares with you before any show. These factory-made CDs are sold by the pair.
Track 1: Play 15 minutes.
Track 2: Select.