1. Home
  2. Docs
  3. Nodes
  4. Audio Effects
  5. Lowpass Filter Node

Lowpass Filter Node

Standard resonant lowpass filter with 12dB/octave rolloff. Frequencies below the cutoff pass through; frequencies above it are attenuated.

In other words, this Node can be used to to create muffled audio, where only the lower frequencies are audible, and the rest are attenuated/muted (e.g. similarly to the sound of a loud disco, as heard from outside on the street).


Audio The Audio line to which the filter is applied.
Frequency-control A Control input to automate the Frequency setting, in Hz, from 10 Hz to the Nyquist frequency. This input can be toggled from the Node settings panel.
Q-control A Control input to automate the Q setting, from 0.0001 to 1000. This input can be toggled from the Node settings panel.


Frequency The cutoff frequency.
Q Sets how peaked the frequency is around the cutoff. The greater the value, the greater the peak.
Filter order Represents the order of the differential equation describing the filter. In essence, this sets how many times the filter is applied.


Audio The filtered audio stream.

Audio and Control lines (visualized with blue and purple, respectively) are both analogous to an analog signal.
They can be used interchangeably, and, for example, an Audio output (blue) can be connected to a Control input (purple), or vice-versa.

Technical details

This Node has exactly 2 samples of latency (equals ~0.0045 milliseconds at 44.1 kHz).

Was this article helpful to you? Yes No