Highpass filter and Lowpass filter

The Highpass filter allows you to cut sounds below a cutoff frequency. The Lowpass filter allows you to cut sounds above a cutoff frequency.

Setup dialog

Highpass filter

Lowpass filter

Specify the cutoff frequencies. The Highpass filter reduces the audio level of sounds below the cutoff frequency to 0 dB. The Lowpass filter reduces the audio level of sounds above the cutoff frequency to 0 dB.
For both filters, if you select a small value for Q, the cutoff is executed gradually.