Korg SDD-3000 Owner's Manual page 22

4
Chorus
Used to obtain a normal chorus effect. Adjust the modulation intensity and Frequency according to the application.
5
Flanging
Used to obtain a flanging effect. If the feedback level is increased too much, oscillations will occur.
6
Envelope flanger
Flanging sound is achieved that is swept by the dynamics (volume level) of the input signal. Especìally effective with
percussive sounds (cymbal, drums, etc.).
7
Trill delay
Used to obtain a trill effect. Adjust the frequency according to the tempo of the tune and adjust the intensity to achieve
the proper pitch change.