10.6

89Logic Pro Effects
• (Attack) Time knob and field: Set the time it takes for the signal to increase from the
threshold level to the maximum Gain level. Attack Time values of around 20 ms and
Release Time values of 1500 ms are a good starting point.
• (Release) Time knob and field: Set the time it takes for the signal to fall from the
maximum gain level to the threshold level.
• (Release) Gain slider and field: Boost or attenuate the release phase of the signal.
When the Gain slider is set to the center position—0%—the signal is unaffected.
• Out Level slider and field: Set the level of the output signal. Drastic boosting or cutting
of either the release or attack phase may change the overall level of the signal. You can
compensate for this by adjusting the Out Level slider.
Logic Pro Expander
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.
Expander parameters
• Input meter: Shows the input signal level.
• Expansion meter: Shows the amount of gain (expansion) applied to the signal.
• Output meter: 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.
• Gain knob and field: Set the amount of gain.
• 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 knob level to avoid distortion. In most
cases, turning on Auto Gain adjusts the signal appropriately.
• 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.