Roland SP-404MK Reference Manual page 187

Appendix MFX List
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Overdrive
Mildly distorts the sound.
Parameter Value
DRIVE 0‒100
TONE -100‒100
BALANCE 100-0‒0-
100 (%)
LEVEL 0‒100
Explanation
Adjusts the amount of distortion.
Sets the tone. Larger settings emphasize the high-frequency range. Smaller settings
emphasize the low-frequency range.
Adjusts the volume balance between dry (the original sound) and effect sound.
Adjusts the volume of the effect sound.