Phase Alignment with Jog Wheel

Hello! Welcome back to your course on DJing DnB.

In the last two lessons, you've isolated the two fundamental components of manual beatmatching. First, you learned to make instantaneous phase corrections with the jog wheel. Then, you learned to match the overall tempo of two different tracks using the pitch fader and BPM display.

Today, we will bridge those skills. Your goal is to use two copies of the same track to practice maintaining phase alignment for 16 bars using only the jog wheel. This exercise is a classic for a reason: by using identical tracks, the tempos are perfectly matched from the start. This removes one variable and allows you to focus exclusively on training your ears to detect the slightest drift and your hands to make the subtle corrections needed to hold two tracks together.

Mastering this skill is what separates a DJ who can start a mix from a DJ who can hold a mix.

1. The Theory: Why Do Identical Tempos Drift?

You might wonder why two tracks playing at the exact same BPM would need any adjustment at all. The answer lies in the concept of phase. Even if the speeds are identical, the beats themselves must be perfectly aligned in time.

To clarify this crucial idea, let's start with a short reading.

As the article explains, if the kick drum of Deck 1 hits a fraction of a second before the kick drum of Deck 2, the tracks are out of phase. This creates an unpleasant "flamming" or "galloping" sound.

Even with modern digital players, this can happen for several reasons:

• Your initial press of the play button might be a few milliseconds off.
• The cue point might not be set with perfect sample accuracy.
• Tiny fluctuations in the playback engine can cause what we'll call micro-drift over time.

Your job during a mix is to be the active "feedback loop," constantly listening for this drift and correcting it before it becomes noticeable.

2. The "Running Double" Drill

This exercise is designed to build the muscle memory and auditory skills for maintaining phase. We'll use two copies of the same track—often called a "running double"—to practice.

Goal: Keep two identical tracks playing in perfect sync for 16 bars (64 beats) using only the jog wheel for adjustments.

What is 16 bars? In DnB, which is almost always in 4/4 time, a bar consists of 4 beats. Therefore, 16 bars is a total of 16 * 4 = 64 beats. This is a standard phrase length in dance music. You can count it as: "ONE-two-three-four, TWO-two-three-four, THREE-two-three-four..." all the way up to sixteen.

Now, let's get to the practical steps. The following reading outlines a very similar exercise. We will adapt it for our goal of holding the mix for 16 bars.

3. Practical Exercise: Holding the Mix (35 minutes)

Now, let's apply this to the decks.

Setup:

1. Choose a Track: Select a DnB track with a simple, percussive intro (just drums is ideal).
2. Load Tracks: Load this same track onto both Deck 1 and Deck 2.
3. Set Cue Points: On both decks, set a cue point precisely on the first kick drum of the track.
4. Headphone Cueing: On your DJM-900NXS2 mixer, press the CUE button for both Channel 1 and Channel 2. This will send both tracks to your headphones, allowing you to hear them together while only one might be playing out of the speakers. Make sure the master volume is down for this exercise.

The Drill:

1. Start Deck 1: Press play on Deck 1. Let it play in your headphones.
2. Start Deck 2: As you listen to Deck 1, count the beats ("1, 2, 3, 4"). On the next "1", press play on Deck 2.
3. Initial Alignment: You will immediately hear if they are in or out of sync.
   • If you hear a single, solid kick drum, they are perfectly aligned.
   • If you hear a "flam" or double-hit sound, they are out of phase. Use the jog wheel on Deck 2 to make a quick correction until the beats lock together.
4. Maintain the Phase: Now, the main task begins. Let both tracks play and listen intently.
   • The moment you hear the beats start to separate, you must act.
   • If Deck 2 sounds like it's "rushing" or slightly ahead, gently place your hand on the top of the jog wheel to slow it down momentarily, or give it a tiny nudge counter-clockwise.
   • If Deck 2 sounds like it's "dragging" or slightly behind, give the jog wheel a very small, gentle nudge clockwise to speed it up.
5. Count to 16 Bars: Your goal is to keep the beats perfectly stacked for a full 64 beats (16 bars).
6. Repeat: If you lose the beatmatch completely, stop Deck 2, re-cue it, and start again from step 2. Don't be discouraged; this takes many repetitions to master. The goal is to increase the duration you can hold the mix each time.

Pro Tip: Train Your Ears, Not Your Eyes
As the first resource mentioned, it's easy to become reliant on the visual waveform displays. To truly master this skill, you must train your ears. Once you feel somewhat comfortable with the drill, try this:

• On the CDJ-3000, press the BROWSE button. This will take you to the track library screen, hiding the detailed waveform.
• Now, repeat the exercise using only your hearing to detect and correct drift. This is significantly harder but is the most effective way to develop the instincts of a professional DJ.

Conclusion

Well done. This lesson was a deep dive into a single, crucial skill: maintaining a beatmatch over time. While it may feel repetitive, this drill is the foundation for every long, smooth transition you will ever perform.

Key Takeaways:

• Even tracks with identical BPMs can drift out of phase.
• Maintaining a mix is an active process of listening for micro-drift and making constant, subtle jog wheel corrections.
• The "running double" exercise isolates this skill by removing tempo differences.
• To truly master beatmatching, you must practice by ear, minimizing reliance on visual aids like waveforms.

Preview of the Next Lesson:
You are now ready to put everything together. You know how to match tempo with the pitch fader and how to align and maintain phase with the jog wheel. In the next lesson, you will perform a complete manual beatmatch by combining tempo and phase adjustments to sync two different DnB tracks. This is the moment where all the components of beatmatching converge.