Low-Pass Filter (LPF)
Definition
A filter that allows frequencies below a set cutoff point to pass through while attenuating frequencies above it. Used to remove high-frequency harshness, add warmth, or create frequency-sweep effects.
In Simple Terms
Cuts everything above a chosen frequency, removing brightness and letting only the lower, warmer tones through. Useful for taming harsh cymbals, softening synths, or creating the muffled "through a wall" effect.
In Practice
A low-pass filter applied to a synthesizer pad gradually closes during a verse, creating a sense of the sound receding before fully opening in the chorus.
Common Confusion
A low-pass filter removes highs, not lows. It passes the lows.