Pioneer Dj DDJ-FLX10 4-Channel DJ Controller for rekordbox and Serato DJ Pro (Black) - Manual (Page 160)

Changing the settings
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Adjusting the buffer size (when using Windows ASIO)
• If an application (DJ software, etc.) is running and using the unit as
the default audio device, quit the application before adjusting the
buffer size.
1 Click the [ASIO] tab.
2 Adjust the buffer size with the slider.
• If a large buffer size is set, drops in audio data (breaks in the sound)
are less likely to happen, but the time lag due to the delay in the
transfer of the audio data (latency) increases.