3 main factors can cause this and there are 3 possible fixes.
■When buffer size is the cause
If the buffer size is too low, sound cutting or noise may occur.
You can adjust buffer size in rekordbox [Preferences] < [Audio] < [Buffer size].
(Windows users can adjust it in [Preferences] < [Audio] < [Setting Utility] < [ASIO tab].)
First, select a large value such as 1024. If the problem clears up, adjust to a value small enough that you can’t feel a delay (latency).
*The appropriate value depends on the system environment.
■When the connection or other equipment is the cause
An unstable connection with your PC/Mac may cause these problems.
To solve this, shut down your PC/Mac and disconnect all other USB devices and USB hubs.
Then, connect the DJM-A9 directly to a different USB port.
■When your system (PC/Mac) is the cause
The following may solve the issue:
- Quit all other applications.
- Disconnect from the internet and exit security software.
- Turn off wireless connections such as Wi-Fi or Bluetooth.
- Turn off power-saving settings.
If your computer's system doesn’t meet the requirements of rekordbox, it might cause the issue. See details on system requirements [here].