Roland SP-404MK Reference Manual page 163

Appendix MFX List
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Zan-Zou
For left and right sounds, this effect applies delay to the negative phase of the sound. This gives the lingering effect of
a sonic "afterimage."
The effect works for stereo sound, and does not have any effect on mono sound.
Parameter Value
TIME 1‒100 (when the SYNC parameter is OFF)
1/32, 1/16T, 1/32D, 1/16, 1/8T, 1/16D, 1/8, 1/4T,
1/8D, 1/4, 1/2T, 1/4D, 1/2, 1/1T, 1/2D, 1/1 (when
the SYNC parameter is ON)
FEEDBACK 0‒99
HF DAMP 200, 250, 315, 400, 500, 630, 800, 1000, 1250,
1600, 2000, 2500, 3150, 4000, 5000, 6300, 8000,
OFF (Hz)
LEVEL 0‒100
MODE 2TAP, 3TAP, 4TAP
SYNC OFF, ON
Explanation
Sets the sound delay time.
Adjusts the amount of feedback for the
effect.
Sets the frequency range at which the
effect sound is attenuated (how clearly
defined the afterimage sounds).
Adjusts the volume of the effect sound.
Sets how the effect sound lingers.
When this is ON, the effect sound
synchronizes with the tempo.