iQ is an equalizer plug-in designed to learn the user's preference. iQ recommends equalizer settings by analyzing user ratings of examples. The result is displayed in a traditional equalizer window where users can fine-tune the recommendation.

With iQ, users indicate how much they like each of a series of example settings by arranging dots from left to right, where each dot represents a different EQ setting. iQ uses a model of auditory perception to gradually hone in on the user's preference. A meter at the bottom of the window indicates when iQ thinks it has learned what the user wants. The user then clicks "Create EQ" and iQ's recommendation is displayed in a traditional equalizer window. Users can also double click any dot to display it in the equalizer window.