EVOC 20 PS filter modulation in Logic Pro for iPad
The formant filter LFO (LFO 1) controls the Formant Shift parameter in the filter bank, enabling you to produce dynamic phasing-like effects. It can either run freely or can be synchronized with the project tempo.
Formant Filter modulation parameters
LFO Rate knob and field: Set the speed of modulation. Values to the left (of the centered position) are synchronized with the host application tempo. These include bar values, triplet values, and so on. Values to the right (of the centered position) are nonsynchronized, and are displayed in hertz—cycles per second.
Note: The ability to use synchronous bar values could be used to perform a formant shift every four bars on a cycled one-bar percussion part, for example. Alternatively, you could perform the same formant shift on every eighth-note triplet within the same part. Either method can generate interesting results and lead to new ideas, or add life to existing audio material.
LFO Waveform pop-up menu: Select the waveform type used by the Shift LFO. You can choose from the following waveforms for each LFO:
Triangle
Falling and rising sawtooth
Square up and down around zero (bipolar, good for trills)
Square up from zero (unipolar, good for changing between two definable pitches)
Random stepped waveform (S & H)
Smoothed random waveform
LFO->Formant knob and field: Define the amount of formant shift modulation by LFO2.
Download this guide: PDF