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Logic Pro and Stereo Files (Part.1)

Écrit par MixCorner le 28 mai 2016, dans - Audio - Dossier - Logic Pro X. | 1906 visites pour cet article.

In this small paper regarding Logic and stereo files, we will first pay attention on the different types of stereo files. Then, we’ll see how Logic manage them.


In the « Audio » domain, an interleaved stereo file means that both channels of the stereo file are included together into a single file. Interleaved stereo files are the most common format found, however in some cases each of the 2 channels are in separate files and each DAW will manage them in a different way. Let’s see how Logic proceeds.


An interleaved stereo file includes 2 channels Left and Right within a single file with 2 interleaved circles are displayed, as in the screenshot below. In this case, the upper waveform represents the Left channel while the waveform below is the Right channel. Attention should be paid that according to the zoom level used, this may appear as a unique file because there is not enough space to display both channels. This kind of stereo file is the one mostly found in projects.


For example, would you need to import a split stereo file for a mix, they will appears as 2 separates files if you have made the import without having « converting » them previously. In order to improve your workflow, you’ll have to rename the files with .L and .R at the end of their name. This process will allow Logic to identify them as an interleaved file and consequently will make the conversion by itself. This leads not only to a reduced number of files in your project but also to a reduction activity of your CPU.

Note that this might not work the same way in other DAWs

Let’s drag and drop 2 split files (with .L and .R) into Logic.

Below, you can see how it is displayed.

A simple look in Logic’s main window will show that it has been converted as an interleaved file.

It is obvious that, such procedure works when the length of the 2 files are identical. Wouldn’t it be the case, Logic will simply consider your files as 2 separate mono files.


This is a very common question and, it has to be said that Logic does not behave « friendly » for such issue. Let’s have a look on how to proceed.

To convert an interleaved stereo files into 2 separate mono files requires that you go on the upper right corner of your window as shown below by the red arrow ( Shortcut « F »). In the Audio Bin (in the Media/Lists area) go to the local Audio File menu.

Once your file is selected, use the « Ctrl + K » key command. Do not modify any settings but the « Stereo Conversion » and select « Interleaved to Separate » and « Enter ».

Logic will then export your file into 2 separate mono files and adds automatically .L and .R at the end of the files’s name.

You’re now able to import again into Logic the 2 mono files after having removed the extension .L and .R in the file’s name.


Whilst the file is in stereo, you’ll be able to read one channel at a time with the following tip. Open the Mixer and go to the stereo « flag » on the top of the track.

Press and click on it and select the desired channel you want to listen to.

Logic will read the selected channel as a « mono file » giving you the opportunity to even modify the pan of the file as you would do on a « regular mono file ». Have a look at the « button » and you’ll see that the channel under concerned is shaded.

For now, we’ve arrived at the end of the first part of « Logic Pro and Stereo Files » article.
The second part to come willl be dealing with the different plugins and tools dedicated to the management of stereo files.
See you soon.


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