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To achieve a seamless blend, you must match the tempo of the two tracks if they are not already the same. Tempo matching involves adjusting one deck’s BPM using the tempo fader on your controller until they synchronize. Many controllers, including the Hercules DJ Control Inpulse, may provide visual aids, such as lights that indicate the direction to move the BPM fader for proper syncing.
While manipulating a song's BPM can result in a unique sound during transition, the ultimate goal is to revert it back to its original speed once the track transition has occurred.