Roland SP-404MK Reference Manual page 171

Appendix MFX List
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303 VinylSim
This effect models the Vinyl Sim effect of the SP-303. The effect simulates the sound of an analog record playing.
Parameter Value
COMP 0‒100
NOISE 0‒100
WOW FLUT 0‒100
LEVEL 0‒100
Explanation
Sets the compression feel, a unique part of the analog recordʼs sound.
Adjusts the volume of the noise.
Sets the inconsistencies (wow/flutter) heard when the analog record "rotates."
Adjusts the volume of the effect sound.