Roland SP-404MKII - Turning Effects On;Off at the Desired Timing

Using the Effects
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Turning Effects On/Off at the Desired Timing
You can make effects apply only while you hold down the effect buttons (EFFECT GRAB).
This lets you quickly turn an effect on/off in time with what you play.
1. Play back a sample.
2. While holding down the [VALUE] knob, press an effect button (such as the [FILTER+DRIVE] button).
The effect turns on only while you’re pressing the effect button.