EVOC 20 PS modulation in Logic Pro for Mac
The Modulation section contains two LFOs that can either run freely or can be synchronized with the Logic Pro tempo.
The Pitch LFO controls pitch modulation of the oscillators, enabling you to produce vibrato effects.
The Shift LFO controls the Formant Shift parameter of the synthesis filter bank, enabling you to produce dynamic phasing-like effects.
Modulation parameters
Int via Whl slider: Set the intensity of LFO pitch modulation. The right half of the slider determines the intensity when the modulation wheel is set to its maximum value; the left half determines the intensity when the wheel is set to its minimum value. By dragging the area between the two slider segments, you can simultaneously move both. This parameter is permanently assigned to the modulation wheel of your MIDI keyboard, or corresponding MIDI data.
Rate knobs and fields: 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.
Waveform buttons: Set the waveform type used by the Pitch LFO (left column) or the Shift LFO (right column). 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
Intensity slider: Define the amount of formant shift modulation by the Shift LFO.