Use ES2 Vector Envelope loop controls in Logic Pro for iPad

The Vector Envelope can run in one-shot mode, as long as the note is sustained; it can be set to repeat a specific number of times or it can repeat indefinitely, much like an LFO modulation. You can create repetitions with the loop functions.

Although the loop parameters seem similar to the loop parameters available for samples, there are significant differences between them. The Vector Envelope only supplies control signals that are used to move the gray dot positions of the Oscillator Mix pad and Mod Pad. The audio output of the ES2 is not looped in any way.

Any point can be declared the Loop point. Provided that the note is held for a suitable length of time, portions of the envelope can be repeated, or looped.

The looped area spans the time between the Sustain point and the Loop point. In between these points you can define several points that describe control point (gray dot) movements in the Oscillator Mix pad and the Mod Pad.

Define a Vector Envelope point as the Loop point

In Logic Pro, drag the Loop Seg slider to the point value that you want to use as the loop point.

Set a Vector Envelope Loop mode

In Logic Pro, tap a Loop Mode button.
- Off: When Loop mode is set to Off, the Vector Envelope runs in one-shot mode from beginning to end, if the note is held long enough to complete all envelope stages. The other loop parameters are disabled.
- Fwd: When Loop mode is set to Forward, the Vector Envelope runs from the beginning to the Sustain point, and then begins to periodically repeat the section between the Sustain point and the Loop point in a forward direction.
- Bwd: When Loop mode is set to Backward, the Vector Envelope runs from the beginning to the Sustain point, and then begins to periodically repeat the section between the Sustain point and the Loop point in a backward direction.
- Altern: When Loop mode is set to Alternate, the Vector Envelope runs from the beginning to the Sustain point and then periodically switches to the Loop point, then back to the Sustain point, alternating between backward and forward directions.

Set the Vector Envelope Loop Rate

You can set a defined speed for the Vector Envelope loop cycle. You can also synchronize the loop speed with the project tempo.

In Logic Pro, rotate the Loop Rate knob to choose one of the following:
- As set: The loop cycle length equals the sum of the times between the sustain and Loop points.
- Rhythmic: Rotate Loop Rate to the left to choose a rhythmic value. The loop rate follows the project tempo. You can choose from 32 bars up to a 64th triplet note value.
- Free: Rotate Loop Rate to the right to set a value (shown in Hz). This indicates the number of cycles per second.
  Note: If Loop Rate is not switched to “as set,” and Loop mode (Forward, Backward, or Alternate) is active, the times of points between the Loop and Sustain points (and the Loop Smooth value) are shown as a percentage of the loop duration, rather than in milliseconds.

Make smooth Vector Envelope loop transitions

In Logic Pro, use the Loop Smooth knob to even out the transition from the Sustain point to the Loop point in Forward or Backward loop mode.
- If the Loop Rate parameter is set to a synchronized value or Free, the loop-smoothing time is displayed as a percentage of the loop cycle duration.
- If the Loop Rate parameter is “as set,” the loop-smoothing time is displayed in milliseconds (ms).

Specify a Vector Envelope loop count

In Logic Pro, use the Loop Count slider to determine a specified number of times the Vector Envelope loop cycle will repeat.
Following the defined number of repetitions, the Vector Envelope runs from the Sustain point onward. Possible values are 1 to 10 and “Infinite.”

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Logic Pro User Guide for iPad