10.6

115Logic Pro Effects
Process Mid-Side recordings with Linear Phase EQ
Mid-Side routing effectively splits a stereo signal into separate stereo and mono signals.
This allows discrete processing of each signal. See Stereo miking techniques for a
description of Mid-Side (MS) recordings.
1. In Logic Pro, insert a Linear Phase EQ instance for each mode in the channel strip: one
for Mid, one for Side. You can also choose to insert a third instance for a stereo signal,
if an overall EQ is useful.
2. Choose a mode from the Processing pop-up menu:
• Mid Only: You hear only the sound of identical signals in each side, such as lead
vocals, and mono signals, such as bass or guitar parts.
• Side Only: You hear only the sound of the different signals in each side, such as
reverbs or backing vocals.
3. Turn on the Analyzer if required. See Logic Pro Linear Phase EQ Analyzer.
4. Adjust the frequency parameters of the Linear Phase EQ instance running in Side mode.
One typical use would be to reduce the low frequencies and perhaps boost the upper
frequencies. This cleans up the bottom end and enhances stereo effects present in
the signal.
5. Adjust the frequency parameters of the Linear Phase EQ instance running in Mid mode.
Often used to boost or sculpt the low frequencies of signals such as bass.
Logic Pro Linear Phase EQ Analyzer
The Analyzer uses a mathematical process called a Fast Fourier Transform (FFT) to
provide a real-time curve of all frequency components in the incoming signal. This is
superimposed over any EQ curves you have set. The Analyzer curve uses the same scale
as the EQ curves, making it easy to recognize important frequencies in the incoming audio.
This also simplifies the task of setting EQ curves to raise or lower the levels of frequencies
or frequency ranges.
The bands derived from FFT analysis are scaled logarithmically—there are more bands in
higher octaves than in lower octaves.
As soon as the Analyzer is activated, you can change the scaling from the default dynamic
range of 60 dB. Drag vertically on the scale to the right of the graphic display to set
the maximum value to anywhere between +20 dB and −80 dB. The Analyzer display is
always dB-linear. There are several additional Analyzer parameters in the Linear Phase EQ
shortcut menus and the extended parameters.
Note: High Analyzer resolutions require significantly more processing power. High
resolution is necessary when attempting to accurately analyze very low bass frequencies,
for example. It is recommended that you turn off the Analyzer after setting EQ parameters.