Roland SP-404MK Reference Manual page 154

Appendix MFX List
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Filter+Drive
This is a filter with overdrive.
It cuts the specified frequencies and adds distortion.
Parameter Value
CUTOFF 20‒16000
(Hz)
RESONANCE 0‒100
DRIVE 0‒100
FLT TYPE Sets the type of filter.
HPF
LPF
LOW FREQ 20‒16000
(Hz)
LOW GAIN -24‒24 (dB)
Explanation
Sets the cutoff frequency range in which the filter works.
Adjusts the filterʼs resonance level.
The larger the value, the more that the frequency range set in CUTOFF is
emphasized.
Adds distortion.
Cuts off the low frequencies.
Cuts off the high frequencies.
Adjusts the frequency range thatʼs boosted or cut by the LOW GAIN parameter.
Adjusts the amount of boost/cut applied to the frequency range thatʼs set in
LOW FREQ.