# Interface: SynthPatchPassFilter

## Highcharts. SynthPatchPassFilter

An EQ filter definition for a low/highpass filter.

### Requires

- module:modules/sonification

### Members

#### Q :number|undefined

  Filter resonance bump/dip in dB. Defaults to 0.

  ##### Type:

  - number | undefined

#### frequency :number|undefined

  Filter frequency.

  ##### Type:

  - number | undefined

#### frequencyPitchTrackingMultiplier :number|undefined

  A pitch tracking multiplier similarly to the one for oscillator volume. Affects the filter frequency.

  ##### Type:

  - number | undefined