Korg Pa4X User Manual page 658

644| Effects for the Sounds
St. Auto Fade Mod. (Stereo Auto Fade Modulatiom)
This stereo chorus/flanger effect enables you to control the LFO speed and
effect balance using auto fade, and you can spread the sound by offsetting
the phase of the left and right LFOs from each other.
Stereo In - Stereo Out
Left
Right
LFO: Tri / Sine
AutoFade
Delay
Feedback
Delay
LFO Phase
LFO Shape
LFO Frequency
FX Amt
FX Amt
High Damp
FX Amt