Logic Pro for iPad 3.3
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Expander in Logic Pro for iPad

Expander is similar in concept to a compressor, but increases, rather than reduces, the dynamic range above the threshold level. You can use Expander to add liveliness and freshness to your audio signals.

To add Expander to your project, choose Dynamics > Expander in a channel strip Audio Effect plug-in menu or the Plug-ins area. See Intro to plug-ins. Also see Add, replace, reorder, and remove plug-ins in the Plug-ins area and Work with plug-ins in the Mixer.

Figure. Expander window.

Expander parameters

  • Input meters: Shows the input signal level.

  • Expansion meter: Shows the amount of gain (expansion) applied to the signal.

  • Output meters: Shows the overall output signal level.

  •  Threshold knob and field: Set the threshold level. Signals above this level are expanded.

  •  Ratio knob and field: Set the expansion ratio—the ratio of signal expansion when the threshold is exceeded.

    Note: Because Expander is a genuine upward expander—in contrast to a downward expander, which increases the dynamic range below the Threshold—the Ratio knob features a value range of 1:1 to 0.5:1.

  • Peak/RMS buttons: Determine whether the Peak or RMS method is used to analyze the signal.

  • Knee knob and field: Determine the strength of expansion at levels close to the threshold. Lower values result in more severe or immediate expansion—hard knee. Higher values result in a gentler expansion—soft knee.

  •  Attack knob and field: Set the time it takes for Expander to respond to signals that exceed the threshold level.

  •  Release knob and field: Set the time it takes for Expander to stop processing the signal after it falls below the threshold level.

  • Auto Gain button: Turn on to compensate for the level increase caused by expansion. When Auto Gain is active, the signal sounds softer, even when the peak level remains the same.

    Note: If you dramatically change the dynamics of a signal (with extreme Threshold and Ratio values), you may need to reduce the Gain slider level to avoid distortion. In most cases, turning on Auto Gain adjusts the signal appropriately.

  • Output Clip buttons: Choose whether to apply clipping above 0 dB, and the type of clipping. Off turns off clip distortion. Soft and Hard change the signal around 0 dB in different ways, resulting in a smoothed or squared off distortion of signal peaks.

  • Gain slider and field: Set the amount of overall gain applied to the signal.

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