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Use impulse responses in Logic Pro for iPad

Space Designer can use either recorded impulse response files or synthesized impulse responses. The Sampled IR and Synthesized IR buttons switch the impulse response mode.

Important: To convolve audio in real time, Space Designer must first calculate any parameter adjustments to the impulse response. This requires a moment or two following parameter edits.

Figure. Space Designer IR parameters.

Impulse response parameters

Use to load, save, or manipulate recorded or synthesized impulse response files. The chosen impulse response file determines what Space Designer uses to convolve with your audio signal.

  • Sampled IR button: Switch to Sampled IR mode. In this mode, an impulse response sample is loaded with the current preset or patch and used to generate reverberation. The name of the loaded IR sample is shown to the left.

  • Synthesized IR button: Turn on Synthesized IR mode. A new synthesized impulse response is generated, derived from the values of the Length, Envelope, Filter, EQ, and Spread parameters.

  • Input Crossfeed knob and field: Determine how Space Designer processes the stereo input signal.

Use Sampled IR mode

In Sampled IR mode, Space Designer loads and uses an impulse response recording of an acoustic environment. This is convolved with the incoming audio signal to place it in the acoustic space provided by the impulse response.

Figure. Space Designer Sampled IR and Synthesized IR buttons.
  1. In Logic Pro, tap the Sampled IR button.

    When you tap the Sampled IR button, the name of the loaded IR sample is shown to the left.

  2. Tap a different Space Designer preset in the Browser to change the impulse response.

Use Synthesized IR mode

In Synthesized IR mode, Space Designer generates a synthesized impulse response based on the values of parameters such as Length, Filter, Spread and various envelope values.

Note: You can switch between a loaded impulse response sample and a synthesized impulse response without losing the settings of the other.

Figure. Space Designer Sampled IR and Synthesized IR buttons.
  • In Logic Pro, tap the Synthesized IR button.

    Repeated taps of the Synthesized IR button randomly generate new impulse responses with slightly different reflection patterns. The current impulse response state is saved with the setting file, including parameter and other values that represent the IR reflection patterns and characteristics.

    Note: Tapping the Synthesized IR button while you’re in Sampled IR mode switches to the synthesized impulse response stored with the setting.

Use the Space Designer Input Crossfeed knob

The Input Crossfeed knob works only in stereo channel configurations.

Figure. Space Designer Input Crossfeed control.
  • In Logic Pro, use the Input Crossfeed knob to determine how a stereo signal is processed.

    • At a value of 1.00 the signal is processed on both channels, retaining the stereo balance of the original signal.

    • At a value of 0.50 the signal is processed in mono.

    • At a value of 0.00 the signal is inverted, with processing for the right channel occurring on the left, and vice versa.

    • In-between positions result in a mixture of stereo to mono crossfeed signals.

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