Roland SP-404MK Reference Manual page 184

Appendix MFX List
>
Hyper-Reso
This is a resonator effect that is adjusted to make creating melodies and bass lines easier.
Parameter Value
NOTE -17‒ -1, 1‒18
SPREAD UNISON, TINY, SMALL,
MEDIUM, HUGE
CHARACTER 0‒100
SCALE C maj‒B maj, C min‒B min
FEEDBACK 0‒99 (%)
ENV MOD 0‒100
Explanation
Sets which note in the chromatic scale should resonate, counting
from the root of the SCALE value.
Sets the octave of the resonator.
Adjusts the brightness and detuning of the sound.
Sets the composite notes (chord) to resonate.
Adjusts the amount of feedback for the effect.
Larger values increase the amount of feedback according to the
input level.