Spree

Spree is a polyphonic chorus effect with per-channel randomised drift applied to each of the effect parameters, so that there is a slight difference in the character of the modulation applied to each polyphonic voice.

Although it can be used with the "spread" parameter set to 0, resulting in a perfectly synchronised chorus effect being applied to all polyphonic channels, Spree is more interestingly applied with a wider spread value, resulting in a wider range of drift between polyphonic channels.

Because the chorus effect applies cyclic modulation to its input, blending in a slightly delayed voice which moves up and down in pitch, having multiple polyphonic channels whose cycles are slightly unsynchronised can give chords and pads a complex, dynamic quality, as the modulation cycles of each voice move in and out of phase with each other.