SoundCraft UREI 1601E User Manual page 35

EFFECT START SYNC
The effect sync (LFO waveform) will re-trigger every time any of the following occurs:
the BPM FX Mix fader is moved away from the [original] position,
either of the BPM FX switches is moved to its [on] position,
or
the selected effect button (1-5) is pressed.
Applying the BPM-FX
If the BPM-FX switch on either of the input channels is set to the ON position, the effects will be applied to that input channel.
If both switches are set to ON, the bpm-fx effects will be applied to the master output.
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