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Forma-8 is a free formant filter which can morph between Vowels using 4 corners of a XY pad. Atomsplitter Audio say that this allows you to apply a range of human sounding effects. There is also a modulation knob which allows you to mix in the amount used and this for a shaking gated effect as it modulates the internal filters.
The designers tell us that resonance and mix controls allow you to apply the effect less powerfully and have just a bit of the effect if you wish. They say that, as well as the vowel selection, you have a choice of spoken and sung types and male and female genders so you can have more choice than simpler range sweeping formant filters.
Pricing and Availability:
Freeware
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