Roland SP-404MK Reference Manual page 185

Appendix MFX List
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Ring Mod
This effect alters the tonal character to make the sound more metallic.
Parameter Value
FREQUENCY 0‒100
SENS 0‒100
BALANCE 100-0‒0-100
(%)
POLARITY OFF, ON
EQ LOW -15‒15 (dB)
EQ HIGH -15‒15 (dB)
Explanation
Sets the frequency range to which the effect is applied.
Adjusts the volume of the effect sound.
Adjusts the volume balance between dry (the original sound) and effect
sound.
Sets the direction in which the frequency modulation moves.
Adjusts the amount of boost/cut of the low-frequency range.
Adjusts the amount of boost/cut of the high-frequency range.