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Table Of Contents
248Logic Pro Effects
Logic Pro Phat FX filter types
Phat FX provides dozens of filter types.
Phat FX filter types: lowpass, bandpass, highpass
A lowpass (LP) filter passes the portion of a signal below a specified cutoff frequency and
rolls off the portion above that frequency. A bandpass (BP) filter passes the portion of a
signal occupying a band surrounding the cutoff frequency and rolls off the portions above
and below that band. A highpass (HP) filter passes the portion of a signal above a specified
cutoff frequency and rolls off the portion below that frequency.
There are multiple two-pole, four-pole, multi-pole state-variable and analog-modeled LP,
BP, and HP filter designs in Phat FX, each with distinctive characteristics that you may
prefer for a given purpose. The available LP, BP, and HP filter designs include Smooth,
Edgy, Rich, Sharp, Clean, and Gritty variants.
Smooth: Two- or multi-pole state-variable filters.
Edgy: Two- or four-pole analog-modeled filters. Four-pole variants provide a steeper
roll-off of frequencies beyond the cutoff.
Rich: Two- or four-pole analog-modeled filters. Four-pole variants provide a steeper
roll-off of frequencies beyond the cutoff.
Sharp: Two-pole analog-modeled filters.
Clean: Bi-Quad filters. These filters have no Drive option.
Gritty: Two-pole filters designed to saturate heavily at higher Res and Drive settings.
The three principal filter controls have standard functions for all filter types.
Cutoff: Controls the filter cutoff frequency.
Res(onance): Controls the filter resonance or emphasis. Higher settings boost
frequencies in the immediate vicinity of the cutoff frequency.
Drive: Allows the filter to be overdriven; the precise effect varies with each filter design.
Phat FX filter types: notch and peaking
A notch filter cuts a narrow band around a resonant frequency. The remainder of the signal
is affected minimally.
Cutoff: Sets the frequency of the cut band.
Amount: Controls the amount of attenuation.
A peaking filter boosts a narrow band around a resonant frequency. The remainder of the
signal is affected minimally.
Cutoff: Sets the frequency of the boosted band.
Gain: Controls the amount of boost. Higher values are generally the most effective.
BW: Sets the bandwidth around the cutoff frequency.