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EVOC 20 TrackOscillator modulation in Logic Pro for iPad

The parameters in this section control the LFO, which can be used to modulate either the pitch of the tracking oscillator, thus creating a vibrato, or the Formant Shift parameter of the synthesis filter bank.

Figure. EVOC 20 TrackOscillator LFO parameters.

Modulation parameters

  • LFO Rate knob and field: Set the speed of modulation. Values to the left of the center position are synchronized with the Logic Pro tempo and include bar values, triplet values, and so on. Values to the right are nonsynchronized, or free, 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.

  • LFO Waveform pop-up menu: Set the waveform type used by the LFO. You can choose from the following waveforms:

    • Triangle

    • Saw Down and Up

    • Square 1 (bipolar, good for trills)

    • Square 2 (unipolar, good for changing between two definable pitches)

    • Sample and Hold and Lag (smoothed) Sample and Hold

    • Sine

  • LFO -> Formant knob: Set the amount of formant shift modulation by the LFO.

  • TO Vibrato knob: Set the amount of (Tracking Oscillator) pitch modulation—vibrato—by the LFO.

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