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EVOC 20 Filterbank Formant Filter in Logic Pro for iPad

The parameters discussed in this section provide precise level and frequency control of the filters.

Figure. EVOC20 Filterbank Filter Bank Settings parameters.

Filter Bank Settings parameters

  • Bands knob and field: Set the number of active frequency bands—up to 20—in each filter bank.

  •  Low and High Frequency knobs: Determine the lowest and highest frequencies allowed to pass by the filter banks. Frequencies that fall outside these boundaries are cut.

  • Low Band Mode buttons: Switch the lowest filter band between bandpass or highpass mode. In bandpass mode, the frequencies above and below the lowest band are ignored. In highpass mode, all frequencies below the lowest band are filtered.

  • High Band Mode buttons: Switch the highest filter band between bandpass or lowpass mode. In bandpass mode, the frequencies above and below the highest band are ignored. In lowpass mode, all frequencies above the highest band are filtered.

  • Resonance knob and field: Determine the basic sonic character of both filter banks. High Resonance settings emphasize the center frequency of each band and result in a sharper, brighter character. Low settings result in a softer character.

  • Slope buttons: Choose the amount of filter attenuation applied to all filters in both filter banks. You can choose 1, which sounds softer at 6 dB/octave, or 2, which sounds brighter at 12 dB/octave.

Filter Bank Crossfade parameters

Figure. EVOC20 Filterbank Crossfade parameters.

  • Boost A and Boost B sliders and fields: Set the amount of boost or cut applied to the frequency bands in filter bank A or B. You can use these controls to compensate for the reduction in volume caused by lowering the level of one or more bands. If you use Boost A and Boost B to set the mix relationship between filter bank levels, you can use Fade AB (see “Fade AB slider” below) to alter the tonal color, but not the levels.

  • Level A< >B knob and field: Crossfade between filter bank A and filter bank B. At the full left position, only bank A is audible, and at the rightmost position, only bank B is audible. In the center position, the signals passing through both banks are evenly mixed. This parameter can be modulated by LFO2. See Filter Bank Crossfade LFO2 parameters.

  • Filter Bank A/B sliders and fields: Set the level of each frequency band in filter bank A or filter bank B.

    Note: All twenty bands of filter bank A and B are always visible, irrespective of the Bands knob value. When the Bands knob is set to a value below 20, both banks will have a corresponding number of active bands, enumerated from band 1 in each bank. All other visible bands above the defined Bands knob value are inactive in both banks and will not impact the audio signal.

    Figure. EVOC20 Filter Bank A parameters.

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