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A1StereoControl by Alex Hilton / A1AUDIO is a Virtual Effect Audio Plugin for macOS and Windows. It functions as a VST Plugin, an Audio Units Plugin, a VST 3 Plugin and an AAX Plugin.
Windows 10 (and above)
OS X 10.9 (and above)
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30-Day: 112; 7-Day: 138; Yesterday: 182

A1StereoControl is a plugin to expand or limit the 'stereo width' or your tracks. It can be used on single or group tracks and is also usable in final mastering situations.

The integrated 'Safe Bass' algorithm centers all bass frequencies below a adjustable value right back into the middle of the stereo field. This gives your tracks the solidity and definition you want while preserving maximum transpancy and sharpness. Similar techniques were used by professional studio producers over ages with either expansive hardware devices like elliptical equalizers or even advanced m/s-processors. With this plugin you will be able to manage this complicated task with a minimum effort.

Additionally A1StereoControl brings you the possibility to place your stereo signal inside the stereo field in a very intuitive way. Our expert mode features different 'pan laws' (0db, -3db, -6db), different pan curves (linear, logarithmic, sin/cos) as well as classic 'balance' mode or 'dual panning'.


  • FREE.
  • VST / VST3/ AU / AAX for MAC & PC (64-bit).
  • Expand or limit stereo wideness (from 0% to 200%).
  • 'SAFE BASS' algorithm centers all bass frequencies (BASS gets MONO).
  • linear phase (important for mastering).
  • RESIZABLE GUI (fully vector-based, nice on 'retina' displays or even very small ones).
  • no latency.
  • 'Phase Flip' (flips the whole input signal 180°).
  • 'Swap L-R' (swaps left and right input channel).
  • 'Mono' turns the input signal to mono, but panning is still possible.
  • all parameters automatable.
  • all parameters fully undoable (undo / redo).
  • /- 12 dB input and output gain.

Latest User Reviews

Average user rating of 5.00 from 4 reviews

Reviewed By battleblaze [all]
May 11th, 2024
Version reviewed: 1 on Mac

Used this for years. Writing this in in 2024. and prefer it even over some paid options. Clear visual layout that's easy to understand. Nothing fancy but as must have as a screwdriver for cleaning up mixes. The ability to expand stereo width while keeping your lower frequencies from widening is so easy.

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Reviewed By JeffRay [all]
April 17th, 2024
Version reviewed: 1.1.1 on Windows

Sometimes a widening function on a mastering compressor or equalizer is good enough. This is for when they aren't. It virtually never fails, is quite easy to use and gives some very useful extras like Mono-folding bass frequencies, phase controls, as well as input and output gain control. Compared to other stereo wideners, it's just better.

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Reviewed By The Chase [all]
May 5th, 2018
Version reviewed: 1.x on Windows

There are a kajillion stereo utility plugs in a similar vein, so which do you use? This one. It's efficient, stable, seemless, and versatile.

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Reviewed By drewskee [all]
August 29th, 2017
Version reviewed: 1 on Mac

This is a great sounding, easy to use stereo widening device. Simple clear interface and provides the ability to both widen and collapse a stereo signal, then pan it within the stereo field. Add reverb to a sound, thin the stereo width then pan it to you'd desired location. Puts things in a specific spot and increasing/decreasing the reverb moves them closer or farther back. A great device, highly recommended.

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Comments & Discussion for Alex Hilton / A1AUDIO A1StereoControl

Discussion: Active
25 July 2019 at 8:41am

it gives to my mixes so mach clarity, & the mix came up to a life.

i very very happy 4 the Results, case' it the most of the best 4 mastrering.

3 April 2020 at 12:42pm

The most of the best freeware waves S1 for stereo mix buss glue mastering enhancer to mastering clarity into/onto the mix on the master buss. It's gives loudness life to the mix with more brighter clarity sonic enhancer saturation, to make the sound more beautiful than ever before, Alex Hilton you are the most of the best.

26 September 2020 at 11:43pm

It's just my basic stereo tool, never missing from the end of my effects chain.

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