Whirl is a unique barber-pole phaser effect plugin that delivers an endless sweeping motion of sound, creating an auditory illusion where one spectrum sweep seamlessly transitions into the next. It is built on a Bode frequency shifter model combined with a feedback line, generating distinctive peaks and notches in the frequency spectrum that move continuously upward or downward. This creates a captivating and dynamic filtering effect that can be tailored to sound subtle or highly dramatic depending on the settings.

The plugin offers up to three fully synchronized barber-pole phaser stages, allowing precise control over the depth and intensity of the effect. At its most intense settings, Whirl can produce deeply resonant filtering that selectively suppresses and enhances individual frequency harmonics, resulting in rich, textured audio transformations. The spectrum sweep frequency is bipolar, enabling smooth and natural transitions between upward and downward motion without interruption, making it suitable for a wide range of creative sound design applications.

Whirl features a user-friendly interface with color-coded elements for easy parameter identification, full automation support, and built-in preset management to streamline workflow. It supports mono and stereo configurations and offers flexible frequency control with synchronization options tied to host tempo. Compatible with AAX, AU, and VST3 formats on both macOS and Windows platforms, Whirl is designed to integrate seamlessly into modern digital audio workstations, providing a powerful and innovative phasing effect for producers and sound engineers.