Take the voice, duplicate it and send it to diiferent locations on panning. L63. L32, R32, R63
Take each one of the voices and modifly slightly the tune, they should not coincide on the same tune value.
These settings will recreate a chorus.
Take three of the 4 voices, and modify the pitch on -1, -2 and -3.
on each voice.
Now you have the same voice on 4 different pitch samples.
The modification on the pitch will affect the length of the sample, and the voices won't sound unisono if you play them together.
So, stretch the time of the three voices to make them fit with the normal one. Stretching time works better with small length samples, sometimes you'll need to separate the words.
With a variphrase, this work should be a piece of cake.