Roland SP-404MK, Reference Manual

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Appendix
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MFX List
Resonator
This effect uses “Karplus-Strong synthesis,” which is often used in physical modeling of sounds.
This lets you alter the sound with a maximum of six “resonators” that match different keys or chords.
Parameter Value Explanation
ROOT C1‒G9 Sets the reference pitch (root note).
BRIGHT 0‒100 Adjusts the tonal brightness.
FEEDBACK 0‒99 (%) Adjusts the amount of feedback for the
effect.
CHORD Root, Oct, UpDn, P5, m3, m5, m7, m7oct, m0,
m11, M3, M5, M7, M7oct, M9, M11 Sets the composite notes (chord) to resonate.
PANNING 0‒100 Sets the panning for the resonator.
ENV MOD 0‒100 Larger values increase the amount of
feedback according to the input level.