Eventide Equivocate Eventide

• Simple yet musical, the 26 linear phase auditory filters are shaped to approximate the critical band filters in your ear.
• Match EQ feature matches the tone of one track to another. Blend two tracks to sound like they came from the same source, complement each other for better separation, or make a final master have a similar tone to a reference track!
• Click and swipe your mouse across the gain slider field to draw an EQ curve. Then toggle Draw Curve off to fine tune.
• Use the output level Auto button to automatically compensate for level changes introduced by the EQ.
• Solo the output of one or more bands to easily find problem frequencies.
• Add or remove filters to customize your sound.
• Includes artist presets from Richard Devine, Jeremy Lubsey, Alex Saltz, Sebastian Arocha Morton, Richard X, and John McCaig.
• Start with the presets or create your own. Use the Compare button to toggle between two unique settings.
• New preset librarian adds Categories, Tags, Descriptions, Artist links, Favorites, and Search to presets.
• Multi level undo/redo for easier workflow.
• True A/B comparison for making better mixing decisions.
• New Delta Listen Mode allows you to hear the changes being applied to your input.
• SET AS DEFAULT button allows you to save any settings as your default.

Science Behind EQuivocate

Humans can only detect the presence of a tone if it is a certain distance from another tone playing at the same time. The Mel Scale defines the arrangement of auditory frequency bands such that each band sounds equally spaced from all others. This division of sound describes how humans hear.

Most graphic EQs are IIR (infinite impulse response) or analog-style filters. These have a lot of great properties, but unfortunately, the shape of an IIR filter isn’t very flexible. For instance, even with every band set flat, the total filter shape isn’t actually flat. Furthermore, when you boost or cut each band, you’re affecting the ones next to it as well. EQuivocate uses a linear phase FIR (finite impulse response) filter that doesn’t have these problems so what you hear is true to what you see on the screen.

Instead of using what DSP engineers call “ideal” rectangular FIR filters, these are triangularly shaped filters. These are often used in hearing models as a first approximation to the critical bands in your inner ear. When you shape filters like the ones in your ear, the filtered signal sounds natural. In a complex signal, at any given time, you can really only hear one sound source in each filter.

EQuivocate’s 26 bands are spread out based on the critical bands of the inner ear. More filters wouldn’t be useful since your ear would just average them together. As a result, EQuivocate simply sounds more natural than any other EQ on the market.