Comb Filter shapes sound by removing specific frequencies at multiples of a base frequency, producing a distinctive effect that resembles the teeth of a comb. It works by blending the original signal with a delayed version of itself, resulting in a filter with repeating peaks and troughs across the audio spectrum. This creates a unique hollowing effect that can add depth and texture to any sound source.

The plugin offers flexible stereo processing by allowing separate treatment of the left and right channels, which can enhance stereo width while maintaining mono compatibility when summed. Key controls include cutoff settings to adjust the spacing between frequency peaks, polarity to invert peaks and troughs, and a mix knob to balance the dry and wet signals. These features enable precise shaping of the comb filter effect, making it suitable for creative sound design and live performance scenarios.

While Comb Filter excels as a standalone tool, it is designed to integrate seamlessly with larger effect units that support modular combinations, providing an inspiring workflow for combining multiple effects. Its flexible user interface allows resizing for optimal control visibility, which is especially useful during live sets. Additionally, Comb Filter is available as a Rack Extension for Reason, expanding its accessibility to users of that platform seeking innovative filtering options.