A1StereoControl – Free Stereo Enhancer VST/AU Plugin By A1AUDIO


A1StereoControl by A1AUDIO.

A1StereoControl is a freeware stereo width control utility in VST/AU plugin format for Windows and Mac based host applications, released by A1AUDIO.

More than just a simple stereo width controller, the plugin offers some great extra features such as switchable pan laws and pan curves, a phase flip switch, channel swap, and a feature called ‘Safe Bass’ which is the reason why I’ll be keeping this one in my VST plugin arsenal.

See also: Free Stereo Enhancer VST Plugins!

The ‘Safe Bass’ feature controls the stereo width of the processed signal below a certain frequency threshold. Basically, all the content below the selected frequency will be mono, which is a great way to keep the low end of your mix in check.

The feature can be useful on the master channel, as well as on individual channels with stereo signals which contain bass frequencies. Many synthesized bass sounds are very wide in order to sound large and full, so it’s a good idea to keep the lowest frequencies of such sounds in mono. Even bass guitars are sometimes processed with a chorus (or similar effects), so adding A1StereoControl to the signal chain could help in preserving a solid low end.

There’s a similar free plugin called Basslane, however it’s Windows only. Now the Mac based users have a nice free alternative in this category.

Bass frequencies aside, the plugin can also control the stereo width of the entire signal. You can go from 0% (effectively mono) to 200% width. The plugin also features a re-sizable GUI (always a nice bonus) and zero latency processing.

A1AUDIO is a new name in the plugin development scene and their first product looks very promising! I’m excited to see their future releases. Judging by the quality of A1StereoControl, we definitely have something to look forward to!

Video Demo

Check out the A1StereoControl demo video:


A1StereoControl is available for free download via A1AUDIO (865 kB download size, ZIP archive, 32-bit & 64-bit VST/AU plugin format for Windows and Mac).

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About Author

Tomislav is a music producer and sound designer from Belgrade, Serbia. He is also the founder and editor-in-chief at Bedroom Producers Blog.


  1. Strange, here commenting works but I can’t comment on the SGA1566 – Free Tube Saturation VST/AU Plugin post anymore. What’s going on, T?

    • cool, i thought im the only one noticed that! i feel better if other user got the same problem and im not the only one or im to dumb.
      i already told that in another topic to tomislav but no one answered or fixed the problem !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

      very uncool. started since the new webdesign.
      the problem is that you insert the right answer in the “no spam” field but it says the captcha is wrong turn back try again.
      no idea why we both seem the only one got that problem.
      sometimes it work, most time it doesnt.

      in that case commenting will die and participating makes no fun.

  2. Very late comment on that. Since my last VST library update this plugin causes very serious processor load. Around 10% per instance. Might be some issue with antivirus software? Anyone with similar problems out there?

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