WaveShaper : Table lookup waveshaping module
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Description
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This module applies a waveshaping-based distortion on the input sound. 
It allows the user to draw the transfert function on the screen.

Sliders
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    **Filter Freq** : 
        Center frequency of the post-process filter
    **Filter Q** : 
        Q factor of the post-process filter

Graph Only
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    **Overall Amplitude** : 
        The amplitude curve applied on the total duration of the performance
    **Transfer Function** : 
        Table used as transfert function for waveshaping

Popups & Toggles
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    **Filter Type** : 
        Type of the post-process filter
    **Polyphony Voices** : 
        Number of voices played simultaneously (polyphony), 
        only available at initialization time
    **Polyphony Spread** : 
        Pitch variation between voices (chorus), 
        only available at initialization time

    