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filter-max

FilterMax

Unify's built-in FilterMax effect is a multi-mode filter with up to four (identical) cascaded stages.

The two pop-up menus along the top of the GUI allow selecting the type of filter and the number of stages. Filter type options are:

  • OFF: the filter is effectively bypassed
  • Low Pass, High Pass, Band Pass: traditional filter types
  • Notch: inverted band-pass filter, aka band-reject filter
  • Peak, LoShelf, and HiShelf: Equalizer (EQ) filter types

The “EQ” filter types are similar to traditional band-pass/band-reject, high-pass, and low-pass filters, but have unity gain outside the pass-band. You can basically build a custom parametric equalizer by using multiple FilterMax instances on a layer, each set to one of the EQ filter modes. (For most uses, it will be simpler and more efficient to use a single instance of the built-in FlexEQ effect.)

The menu on the right allows you to select the number of filter stages:

  • 12 dB: single stage, 12 dB/octave roll-off (when Q=0.707; see below)
  • 24 dB: single stage, 24 dB/octave roll-off
  • 36 dB: single stage, 36 dB/octave roll-off
  • 48 dB: single stage, 48 dB/octave roll-off

The three knobs allow adjusting the filter parameters as follows:

  • Frequency is the filter's cutoff frequency in Hz
  • Q, aka resonance or emphasis, modifies the shape of the response curve near cutoff frequency
    • The default value 0.707 provides no emphasis
    • Higher values create a resonant “bump” in the frequency response just before the cutoff, and a slightly sharper roll-off slope
    • Lower values reduce the roll-off slope
  • Gain (calibrated in decibels) is interpreted differently for different filter types:
    • For traditional filter types, this is simply a gain stage after the filter. Positive gain values can compensate for reduced overall gain when filtering aggressively, especially using high-pass or band-pass modes. Negative gain values are very useful for taming the effects of high Q settings.
    • For “EQ” filter types, the Gain knob sets the filter's pass-band gain. At the default value of 0 dB,

you will not hear any effect from “EQ” filters.

filter-max.txt · Last modified: 2021/09/02 22:03 (external edit)