Audio Filters

Discord Player supports various audio filters. There are 4 types of audio filters in discord-player.

FFmpeg

The most common and powerful method is FFmpeg. It supports a lot of audio filters. To set ffmpeg filter, you can do:

await queue.filters.ffmpeg.toggle(['bassboost', 'nightcore']);

Note that there can be a delay between filters transition in this method.

Equalizer

This equalizer is very similar to Lavalink's 15 Band Equalizer. To use this, you can do:

queue.filters.equalizer.setEQ([
    { band: 0, gain: 0.25 },
    { band: 1, gain: 0.25 },
    { band: 2, gain: 0.25 }
]);

There is no delay between filter transition when using equalizer.

Biquad

This filter provides digital biquad filterer to the player. To use this, you can do:

import { BiquadFilterType } from 'discord-player';
 
queue.filters.biquad.setFilter(BiquadFilterType.LowPass);
// similarly, you can use other filters such as HighPass, BandPass, Notch, PeakEQ, LowShelf, HighShelf, etc.

There is no delay between filter transition when using biquad filters.

DSP Filters

This is another type of audio filters provider. It currently supports Tremolo and 8D filters only. To use this, you can do:

queue.filters.filters.setFilters(['8D']);

There is no delay between filters transition using this filter.