How To Create A Mid/Side Matrix Manually In Logic Pro

Mid/Side processing enables you to decode a stereo signal into two parts. The Mid channel contains the information that appears in both the left and right channels, and the Side channel contains all the information that is different between the left and right channels.

Although there are several plugins that can do the decoding for you, like the free Brainworks bx solo plugin and the free Voxengo MSED plugin, and Mathew Lane’s DrMS, creating a Mid Side matrix yourself is an excellent way to learn more about using the concept of Mid Side Processing in Logic Pro. All you need is some routing skills, and the Gain plugin.

Manually Creating a Mid Side Matrix

  1. Split a stereo file into a left and a right part (read this post on doing this in Logic, there’s a caveat). Put them on mono tracks 1 & 2. Pan at center.
  2. Duplicate the left and right parts. Put them on mono tracks 3 & 4. Pan at center.
  3. With the mono Gain plugin, invert phase on track 4.
  4. For track 1&2, set Bus 1 as Output.
  5. For track 3&4, set Bus 2 as Output.
  6. Put an Aux Send to Bus 3 on Bus 1.
  7. Put an Aux Send to Bus 4 on Bus 2.
  8. Verify your Buses are mono.
  9. Pan Bus 1 & 2 hard left, 3 & 4 hard right.
  10. With the mono Gain plugin, invert phase on bus 4.

Making groups for tracks 1 & 2 and 3 & 4 comes in handy. You should now have something like this:

making a mid side matrix

A Mid/Side Matrix, created manually in Logic Pro.

There you have it. You can control the Mid level with ‘mid’ group 1 (track 1 & 2). Control the Side level with ‘side’ group 2 (track 3 & 4).

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  • Eric

    Yo Mr Danski, on the iPad the right side is all messed again on your pages. I should also mention that the search function needs a bit of work. Try searching for – Match EQ. And what happens if there are multiple matches for a word or words? Sorry to be the bearer of bad news but I mention this because I care!

    • Hey Eric,

      Thanks for the heads up. I just saw what happens on the iPad.
      Looks like a tough bug to crack, especially since I’ve dropped
      the responsive structure altogether with this blog’s new design.
      So, iPhones and iPads should just render the webpage just like
      the desktop version…

      I just tested my site on Google’s Chrome browser for iPad, and
      it renders flawlessly. This makes me suspect the bug is specific
      to Safari on iPad. May I suggest you use Chrome too for the time being? It’s a speedy browser, and free.

      Search can be a lot better, yes. I’m thinking of replacing it with Google’s custom search.

      Once I get back from my holiday, I’ll finish this to-do list!

      Kind regards and thanks again.


      Sent from my iPad

  • Thanks Danski.

    Problem with this is that from your starting point, your mid is going to be louder than side because the side is getting phase inverted while the mid is getting doubled. I wonder if some genius knows the exact amount of db to turn the mid down to re-compensate the balance?

    • Hey Clave,

      I’ll have a look at that, thanks.


  • also, rather than splitting the stereo file laboriously, if you click and hold the stereo icon on the track, you can select various options including left or right. So you can just duplicate the stereo track 4 times, then make two of them left and two right. Bit easier 🙂

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