Standard bandpass filter. Frequencies outside the given range of frequencies are attenuated, frequencies inside it pass through.
In other words, this Node can be used to only keep a given range of frequencies in an audio source (e.g. frequencies around 1 kHz), and attenuate/mute the rest.
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.
This Node has exactly 2 samples of latency (equals ~0.0045 milliseconds at 44.1 kHz).