Roland SP-404MK Reference Manual page 177

Appendix MFX List
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JUNO Chorus
This effect models the chorus section of the Roland JUNO-106 and JX series.
Parameter Value
MODE JUNO 1, JUNO 2, JUNO12, JX-1
1, JX-1 2
NOISE 0‒100
BALANCE 100-0‒0-100 (%)
Explanation
Sets the type of effect.
Adjusts the volume of noise generated by the effect.
Adjusts the volume balance between dry (the original sound)
and effect sound.