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Logic Pro for iPad 3.3
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Use the ES1 modulation envelope in Logic Pro for iPad

The modulation envelope can directly modulate a chosen parameter. It controls the time it takes for the modulation to fade in or fade out. At its center position (Off), modulation intensity is static—no fade-in or fade-out occurs. When set to its full value, modulation intensity is at a constant level.

The modulation envelope allows you to set either a percussive type of decay envelope by choosing low values or an attack type of envelope by choosing high values.

Tap the Mod Sources button at the top of the plug-in to view and adjust these ES1 parameters.

Figure. Modulation Envelope.

Modulation Envelope parameters

  • Time slider and field: Set a fade-in (attack) or fade-out (decay) time for the modulation. Drag upward to set a fade-in. Drag downward to set a fade-out. When set to the center position (Off), the modulation envelope fade is turned off.

  • Destination pop-up menu: Choose a modulation target for the modulation envelope.

    • Pitch: Modulate the pitch—the frequency—of the oscillators.

    • PW: Modulate the pulse width of the pulse wave.

    • Mix: Modulate the mix between the primary oscillator and the sub-oscillator.

    • Cutoff: Modulate the cutoff frequency of the filter.

    • Res.: Modulate the resonance of the filter.

    • VCA: Modulate the main volume.

    • FM: Use the triangle waveform to modulate filter cutoff frequency. This modulation can result in a pseudo-distortion of the sound, or it can create metallic, FM-style sounds. The latter occurs when the only signal you can hear is the self-oscillation of the resonating filter.

    • LFO: Modulate the overall amount of LFO modulation.

  • Vel Min/Max sliders and fields: Set the upper modulation envelope limit for the hardest keystrike (velocity=127) with the Max slider. The Min slider sets the lower limit for the softest keystrike (velocity=1). The distance between the sliders indicates the range of velocity values that alter the intensity of the modulation envelope.

Modulate a parameter with velocity

  1. In Logic Pro, select a modulation target, such as PW (Pulse Width), from the Destination pop-up menu.

  2. Set the Time slider to the center (Off) position, and adjust the Vel Min/Max sliders as needed.

    This results in a velocity-sensitive modulation of the oscillator pulse width.

    More interestingly, you can directly control the LFO level if you choose LFO in the Destination pop-up menu.

Fade the LFO modulation in or out

  • In Logic Pro, drag the Time slider upward to fade in the LFO modulation. The higher the value, the longer it takes for you to hear the modulation.

  • Drag the Time slider downward to fade out the LFO modulation. The lower the value, the shorter the fade-out time is.

    LFO control with envelopes is most often used for delayed vibrato, a technique many instrumentalists and singers employ to intonate longer notes.

Set up a delayed vibrato

  1. In Logic Pro, drag the Time slider upward.

  2. Select Pitch as the LFO target in the Destination pop-up menu.

  3. In the LFO section, use the Wave knob to select the triangular wave as the LFO waveform.

  4. Set the (LFO) Rate knob to a rate of about 5 Hz.

  5. Set the (LFO) Wheel Max slider to a low value, and the (LFO) Wheel Min slider to zero.

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