Pioneer Dj DDJ-FLX10 4-Channel DJ Controller for rekordbox and Serato DJ Pro (Black) - Manual (Page 122)

Serato DJ Pro
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4 Move the channel fader to the top.
5 Turn the [MASTER LEVEL] knob to adjust the volume of the
speakers to a level you’re happy with.
Adjust the volume of sound output from the [MASTER 1] output terminals or
[MASTER 2] output terminals.
• If you can’t output sound from the [MASTER 1] output terminals or
[MASTER 2] output terminals or the unit isn’t recognized by your PC/Mac,
refer to the [FAQ] on the Pioneer DJ support website.
pioneerdj.com/support/