Roland SP-404MK Reference Manual page 166

Appendix MFX List
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Stopper
This effect lowers the sample playback speed, reproducing the sound of a turntable stopping.
Parameter Value
DEPTH 0‒100
RATE 1/128, 1/64, 1/32, 1/16, 1/8,
1/4, 1/2, 1, 2
RESONANCE 0‒100
FLT MOD 0‒100
AMP MOD 0‒100
Explanation
Adjusts how much the playback speed should be slowed
down.
Sets the period at which the playback speed is changed.
Adjusts the filterʼs resonance level.
Increasing the value further emphasizes the effect, for a
more unusual sound.
Attenuates the high-frequency range according to the
playback speed.
Lowers the volume according to the playback speed.