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Set Up Unison Technology with your Apollo Interface
Unison Basics
Unison™ technology is an audio processing breakthrough that starts right at the source — the input stage — allowing UA audio interface mic preamps to sound and behave like the world’s most sought-after tube and solid-state designs. By capturing the all-important impedance, gain stage “sweet spots,” and component-level circuit behaviors, Unison gives UA interfaces the tone and feel of legendary mic preamps from UA, API, Neve, SSL, Manley and more.
When plugging into the front panel instrument input, Unison technology can also emulate the input impedance of guitar and bass amps from Fender, Marshall, Ampeg, Eden, ENGL and Fuchs — and even famed guitar effects like the KORG SDD-3000 Delay. This is crucial to capturing these unique devices’ signature tones.
Activating Unison Preamps
Unison is activated by inserting any Unison-enabled UAD plug-in into the special Unison insert available on UA audio interface Console software. Simply click the UNISON+ insert to select a Unison-enabled plug-in from the Insert Assign popover window. Unison can be used on more than one input simultaneously, so you can effectively create a vintage Neve console tracking experience, for example, with incredibly authentic results.

You’ll know Unison technology is enabled when the ring surrounding the Gain knob on your interface software and hardware illuminates in orange.
Unison inserts are available on all UA audio interfaces with mic preamps as follows:
Apollo Twin:   Preamp input channels 1 & 2
Apollo, Apollo 8:         Preamp input channels 1 – 4
Apollo 8p:       Preamp input channels 1 – 8
Apollo 16:       N/A (Apollo 16 has no mic preamps)
Under the Hood
As noted, Unison-enabled UAD plug-ins reconfigure UA interface mic preamps’ physical input impedance, gain staging response, and other parameters to match the emulated preamp’s characteristics. So when you place a Unison-enabled preamp plug-in like the Manley VOXBOX in the Unison insert slot, you get a spot-on emulation of the original hardware.
The secret is the bi-directional communication between the Unison plug-in and the digitally controlled audio interface mic preamps — a feature found only on UA audio interfaces. Because the UA interface hardware and UAD software are tightly integrated, Unison provides continuous, realtime, two-way control and interplay between physical mic preamp controls and the software settings.
The easiest way to learn more about Unison mic preamp emulation is to pull up a few Unison-enabled plug-ins and record your favorite sources. You’ll quickly hear what a big difference it can make.
Unison is just one of the many ways UA audio interfaces give you authentic analog sound, every time you record.