Technical Inquiry – XDJ-XZ DVS Dual Phase Audio Dropouts (Rekordbox)

Dear Pioneer DJ Support Team,

I hope you are well.

I am contacting you regarding a persistent technical issue encountered while using the XDJ-XZ in DVS mode with Rekordbox. This issue has been extensively tested and reproduced under multiple configurations.

🔧 System Configuration:

• Product: XDJ-XZ
• Software: Rekordbox (tested on v6.7.7 and latest v7.x)
• OS: macOS Tahoe (latest version)
• DVS Input: Phase (2 remotes, Relative mode)
• Turntables: Reloop RP-7000 MK2
• Additional controllers: XP1 / XP2 (via powered USB hub)
• Audio buffer: tested between 2.8 ms and 15 ms

⚠️ Issue Description:

When operating two Phase-controlled decks simultaneously, the system exhibits:

• Intermittent audio dropouts (approx. 0.2–1 second)
• Both decks drop audio simultaneously
• No loss of synchronization (playback resumes aligned)
• Issue persists regardless of CPU load (system not overloaded)

✅ Control Tests:

• Single Phase deck + one internal deck → stable
• DVS using needles → significantly more stable
• Removing XP controllers → no significant improvement
• Phase connected directly to Mac (no hub)
• XDJ-XZ connected directly to Mac

🔍 Additional Observations:

• Increasing buffer size reduces frequency but increases dropout duration
• Waveform rendering settings (speed, type, layout) significantly affect stability
• Horizontal waveform layout performs better than vertical
• Disabling “Full Waveform” improves stability
• Behavior suggests a shared USB/audio pipeline interruption

❓ Key Questions:

1. Is the XDJ-XZ USB/audio architecture designed to handle dual DVS Phase inputs simultaneously without interruption?
2. Are there known limitations when combining:
   • DVS (Phase)
   • HID control
   • waveform data transfer
3. Is there a recommended configuration for stable dual-deck Phase usage on XDJ-XZ?
4. Is a driver or firmware update planned to improve stability on newer macOS versions?

🧠 Technical Hypothesis:

Based on testing, the issue appears to be related to:

• USB endpoint scheduling
• Audio + HID traffic contention
• Internal buffering behavior of the XDJ-XZ

I would greatly appreciate a detailed technical response, as this issue significantly affects professional DVS performance.

Thank you in advance for your support.

Kind regards,
Paul Ghanimeh