Roland AIRA Compact E-4 Voice Tweaker - Manual (Page 34)

Adding Reverberation (REVERB)
34
Using effects other than reverb
1. Move the [REVERB] slider while holding down the [VOCODER] button to select an effect.
Value Explanation
Rvb
(Reverb) Adds reverberation.
Echo
(Echo) Adds an echoing sound.
DIy
(Delay) Repeats the sound of your voice in sync with the tempo.
Cho
(Chorus) Adds a stereo feel to the sound.