Harmonizer module with two voices.

Sliders under the graph:
-Transpo Voice 1: Pitch shift of the first voice (in semi-tones).
-Transpo Voice 2: Pitch shift of the second voice (in semi-tones).
-Feedback: Amount of transposed signal fed back into the harmonizers (feedback is voice independent).
-Harm1/Harm2: Mix between the first and the second harmonized voices.
-Dry/Wet: Mix between the original signal and the harmonized signals.

Dropdown menus and toggles:
-Win Size Voice 1: Window size of the first harmonizer for delay (1, 0.75, 0.5, 0.25, 0.2, 0.15, 0.1, 0.05 or 0.025).
-Win Size Voice 2: Window size of the first harmonizer for delay (1, 0.75, 0.5, 0.25, 0.2, 0.15, 0.1, 0.05 or 0.025).
-# of Polyphony: Number of voices played simultaneously (polyphony); only available at initialization time.
-Polyphony Spread: Pitch variation between polyphony voices (chorus); only available at initialization time.

Graph only parameters:
-Overall Amplitude: The amplitude curve applied on the total duration of the performance.

