Pioneer Dj DDJ-FLX10 4-Channel DJ Controller for rekordbox and Serato DJ Pro (Black) - Manual (Page 55)

Part names and functions
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4 BEAT  button
Press:
Increases the number of beats for synchronizing the Beat FX sound each time
the button is pressed.
[SHIFT] + press:
Sets the Beat FX Tempo mode to BPM Tap mode. The BPM used as the basis
for Beat FX is set in time with your tapping of the button.
5 BEAT FX select knob
Changes the Beat FX.
6 BEAT FX CH select knob
Changes the channel that Beat FX will be applied to.
7 BEAT FX LEVEL/DEPTH knob
Adjusts the parameter of Beat FX.
8 BEAT FX ON/OFF button
Press:
Turns Beat FX on/off.
[SHIFT] + press:
Turns Release FX on/off.
9 BEAT FX indicators
Light up for the channel selected with the BEAT FX CH select knob.
When
[MST] is selected, the indicators of all channels light up.
When Beat FX is on, the indicator flashes on the channel to which the effect is
applied.
10 COLOR knobs
Change the parameter of Sound Color FX for each channel.