Facebook tracking pixel
Perception screenshot

Ian Shepherd's Perception AB

Eliminate loudness "deception."

Add to Cart
or click here to upgrade...

The ultimate A/B plugin for mixing and mastering

With Perception AB, you can...

Compare before and after
with level-matching.
Quickly A/B test effects
with plugin delay compensation.
Bypass your entire mix
with a single click.
A/B test individual channels
in the context of the whole mix.
Spot sneaky plugin presets
Hear what your processing really sounds like.
Compare with reference tracks
at online streaming levels.

How Does it Work?

See Perception AB in action.

Sound On Sound Magazine logo
Perception is recommended without reservation, for anyone involved in mastering, at any level. Hugh Robjohns (Sound On Sound Magazine)

Better? Or Just Louder?

How can you be sure?

Loudness dial

Loudness changes our perception of music. Louder may seem better at first, but it's easy to be fooled. When mixing and mastering, you must constantly ask yourself, "Is this really better? Or just louder?" The way to make reliable, real-world judgements is to listen with matched loudness. This has always been a key skill for mixing and mastering engineers, which can take years to learn. Until now...

MusicTech Magazine Excellence Award
Since adding Perception to our plug-in library, we've become almost addicted to it. Mike Hillier (MusicTech Magazine)

Loudness Deception

Make informed decisions about your music.

Perception AB instantly and automatically matches the level of the music you're listening to, allowing you to hear past the “loudness deception” and make clear, real-world decisions about the best possible sound for your music, quickly and easily. You can bypass entire processing chains to make before and after comparisons of EQ settings, compression and more while mixing or mastering. You can even bypass external analog gear!

Level-Matched A/B Testing

How does it work?

Match level button

Simple. First, insert the Perception AB plugin before the processing chain you want to test, and select "Pre". Second, insert the plugin at the end of the chain and select "Post." Click "Match Level" and you can toggle between the Pre and Post audio to compare your music before and after the processing chain with level-matching and full delay compensation.

Faster, More Flexible

Now optimized for mixing and mastering

Audio Media Gear of the Year 2014 Sound on Sound award nominee

The original award-winning Perception was ground-breaking - the first ever plugin to offer easy, loudness-matched A/B comparisons in mastering, for any processing chain. Now Perception AB is the first to be fully optimized for mixing as well, enabling you to seamlessly bypass your entire mix (or any part of it) with a single click, without hearing a change in loudness.


Praise for Perception

The time saved easily justifies the price. It's so good you'll be asking yourself why nobody came up with the idea before. I just wish I had this in my toolbox long ago! Bill Lacey (Resolution Magazine)
Every now and again a plugin comes along that makes you think 'How did I work without this?' - Perception is such a plugin... even as an experienced engineer, Perception helped my workflow massively. Alan Branch (Audio Media International)
The phrase 'game changer' is flung about too often these days... [Perception is] as near as you'll get these days. Recording Review.com


  • Bypass any processing chain
  • Fast A/B testing
  • Automatic loudness matching
  • Plugin delay compensation
  • Optimized for mixing - new Bypass All function
  • Multiple loudness matching modes
  • Easy bulk insertion

Plugin Formats

AAX logo Audio Units logo VST logo
  • macOS 10.7 or later (64-bit Intel or Apple Silicon)
  • Windows XP SP3 or later (32/64-bit)

  • Available for immediate download
  • Pay with credit card or PayPal
  • 60 day money-back guarantee
Add to Cart

Enter the email address that you used when purchasing Perception v1 and we'll email you an upgrade discount code: