Roland AIRA Compact E-4 Voice Tweaker - Manual (Page 15)

Using a Vocoder Voice to Alter the Sound (VOCODER)
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Using a Vocoder Voice to Alter the Sound
(VOCODER)
This feature changes your voice to a vocoder voice.
A vocoder is an effect that combines the sounds of a built-in synthesizer (carrier) with your voice input (modulator).
1. Press the [VOCODER] button to make it light up.
This activates the vocoder.