Apple MainStage 3 Instruments - MainStage 3 Instruments
Apple MainStage 3 Instruments - MainStage 3 Instruments
Apple MainStage 3 Instruments - MainStage 3 Instruments
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••<br />
Formant Stretch knob: Rotate to change the width and distribution of all bands in the synthesis<br />
filter bank. This can be a broader or narrower frequency range than that defined by the Low<br />
and High Frequency parameters.<br />
••<br />
When Formant Stretch is set to 0, the width and distribution of the bands in the synthesis<br />
filter bank match the width of the bands in the analysis filter bank. Low values narrow the<br />
width of each band in the synthesis filter bank, whereas high values widen the bands. The<br />
control range is expressed as a ratio of the overall bandwidth.<br />
••<br />
Formant Shift knob: Rotate to move all bands in the synthesis filter bank up or down the<br />
frequency spectrum.<br />
••<br />
When Formant Shift is set to 0, the positions of the bands in the synthesis filter bank match<br />
the positions of the bands in the analysis filter bank. Positive values move the synthesis filter<br />
bank bands up in frequency, whereas negative values move them down—in respect to the<br />
analysis filter bank band positions.<br />
When combined, Formant Stretch and Formant Shift alter the formant structure of the resulting<br />
vocoder sound, which can lead to interesting timbral changes. For example, using speech signals<br />
and tuning Formant Shift up results in “Mickey Mouse” effects.<br />
Formant Stretch and Formant Shift are also useful if the frequency spectrum of the synthesis<br />
signal does not complement the frequency spectrum of the analysis signal. You could create a<br />
synthesis signal in the high-frequency range from an analysis signal that mainly modulates the<br />
sound in a lower-frequency range, for example.<br />
Note: The use of the Formant Stretch and the Formant Shift parameters can result in the<br />
generation of unusual resonant frequencies when high Resonance settings are used.<br />
Chapter 8 EVOC 20 PolySynth 150