10.6

91Logic Pro Effects
• Lookahead knob and field: Adjust how far ahead (in milliseconds) Limiter analyzes the
audio signal. This enables it to react earlier to peak volumes by adjusting the amount
of reduction.
Note: Lookahead causes latency, but this has no perceptible effect when you use
Limiter as a mastering effect on prerecorded material. Set it to higher values if you
want the limiting effect to occur before the maximum level is reached, thus creating
a smoother transition.
• Mode pop-up menu: Choose between Legacy and Precision algorithms. Use Precision
for hard limiting, but be aware that this can introduce distortion artifacts.
• Soft Knee button (Legacy mode): Turn on to limit the signal only when it reaches the
threshold. The transition to full limiting is nonlinear, producing a softer, less abrupt
effect, and reducing distortion artifacts that can be produced by hard limiting (in
Precision mode).
• True Peak Detection button (Precision mode): Turn on to detect inter-sample peaks
in the signal.
Multipressor
Logic Pro Multipressor overview
Multipressor (an abbreviation for multiband compressor) is a versatile audio mastering
tool. It splits the incoming signal into different frequency bands—up to four—and enables
independent compression of each band. After compression is applied, the bands are
combined into a single output signal.
The advantage of compressing different frequency bands separately is that it allows
more compression to be applied to bands that need it, without affecting other bands.
This avoids the “pumping” effect often associated with high amounts of compression.
Because the use of higher compression ratios on specific frequency bands is possible,
Multipressor can achieve a higher average volume without causing audible artifacts.
Raising the overall volume level can result in a corresponding increase in the existing
noise floor. Each frequency band features downward expansion, which lets you reduce
or suppress this noise.
Downward expansion works as a counterpart to compression. Whereas a compressor
compresses the dynamic range of higher volume levels, the downward expander expands
the dynamic range of the lower volume levels. With downward expansion, the signal is
reduced in level when it falls below the threshold level. This works in a similar way to a
noise gate, but rather than abruptly cutting off the sound, it smoothly fades the volume
with an adjustable ratio.
See the Multipressor Display, Frequency Band, and Output parameter sections, and
use tips.