Roland E-4 Owner's Manual page 16

Using a Vocoder Voice to Alter the Sound (VOCODER)
Setting the carrier waveform (WAVEFORM)
Setting the carrier waveform changes the harmonic structure of the sound.
1. Move the [FORMANT] slider while holding down the [VOCODER] button.
Value
Saľ2 (Saw2)–Sa.49 (Saw49)
Sa.50 (Saw50)–Saľ1 (Saw1)–Sq.49 (Square49)
Sq.50 (Square50)–Sqr (Square)–PI.49 (Pulse49)
PI.50 (Pulse50)–PIs (Pulse)–ni49 (Noise49)
ni50 (Noise50)–nis (Noise)
16
Sawtooth wave with only a small amount of the fundamental frequency
Sawtooth wave
Square wave
Pulse wave
Noise
Explanation