Sample Alchemy lowpass, bandpass, and highpass filters in Logic Pro for iPad
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 LP, BP, and HP filter designs in Sample Alchemy, each with distinctive characteristics that you may prefer for a given purpose. The available LP, BP, and HP filter designs include:
Sharp: Two-pole analog-modeled filters.
Edgy: Two- or four-pole analog-modeled filters. Four-pole variants provide a steeper roll-off of frequencies beyond the cutoff.
Clean: Bi-Quad filters.
Gritty: Two-pole filters designed to saturate heavily at higher resonance (Res) settings.
Sample Alchemy lowpass, bandpass, and highpass filter parameters
The filter controls have standard functions for all lowpass (LP), bandpass (BP), and highpass (HP) filter types.
Cutoff knob: Controls the filter cutoff frequency.
Res(onance) knob: Controls the filter resonance or emphasis. Higher settings boost frequencies in the immediate vicinity of the cutoff frequency.
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