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Step into a new dimension of stereo control with Voxengo MSED – a professional, no-compromise audio mid-side encoder-decoder AudioUnit, AAX and VST plugin designed for audio engineers and creative producers alike. Whether you're tightening a mix, widening a synth pad, or repairing phase issues, MSED gives you surgical command over the heart and soul of your stereo image.
At its core, MSED effortlessly splits any stereo track into its Mid (center) and Side (ambient) components – and seamlessly reconstructs them back. But it doesn't stop there. With the "Inline" mode, you can adjust gain, panning, and mute status for Mid and Side channels independently without needing multiple plugin instances. That means faster workflow, cleaner routing, and zero clutter.
Need to flip phase by 180°, swap channels, or extract only the Mid or Side signal? MSED handles it instantly. And with its stunning Plasma Vector Scope, you don't just hear the stereo field – you see it. This unique, frequency-aware visualizer places low frequencies at the outer edge and high frequencies toward the center, helping you spot phase issues, balance problems, and correlation irregularities at a glance.
Add to that stereo correlation and balance meters, zero processing latency, and 64-bit floating-point precision, and you have a lightweight yet powerful tool that fits seamlessly into any session.
Voxengo MSED isn't just a utility – it's your stereo scalpel. Clean. Fast. Visual. Essential.
Reviewed By alienimplant [all]
January 2nd, 2026
Version reviewed: 3.1.2 on Mac
I cannot live without this plugin. I use it to fix nearly all mid-side, phase cancellation/correlation issues. I would pay for this plugin if I had to.
Reviewed By RobertSchulz [all]
July 25th, 2022
Version reviewed: 1.0 on Windows
[Note before: I don't know why it is described on KVR as "No Longer Available", you can still download it at the Voxengo website for free.].
My review:
Might be the best free M/S-Tool on the market.
It does allow you to do so much things when you dig around with M/S-processing.
You can not only use it as M/S-encoder and decoder, it also gives the possibility to adjust, the volume of sum (mid) and the difference (sides), pan them whereever you want in the stereofield, swap 180* degree phase, swap them with each other and mute to listen to one specific channel for mixing. Plus you have a vectoscope to the right side to visualize the changes in real time and a correlator and stereo balance viszualizer at the bottom.
Also as it is a Voxengo plugin, you can costumize the visualizations of the plugin, like I encounter nowhere else on the market.
Really great tool every mixer should have unless you haven't something similar (which will be hard to find).
Candy at last:
A TIP you can find in the manual: By clicking CTRL/CMD and dragging either Mid or the SIDE one of the Gain or Pan knobs, the other also moves in parallel to the movement of your mouse. If you do RIGHTMOUSE-click and drag, the movements are interpolated.

Hey, while you're at it -- update a screenshot already! :) It looks much, much better and more functional now! :)
Thank you for the plugin, my all-time favourite.
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