Logic Pro treats audio files with a name that ends in .L or .R as stereo files. This applies to all file management functions, such as Rename, Create, or Revert to Backup. The following list outlines how split stereo files are handled in Logic Pro:
When you select an independent mono file (one side of a split stereo file “pair”) in the dialog, both channels are imported. Split stereo regions are indicated by the stereo symbol: two adjoining circles.
You can see both files in the Audio Bin. They have the same name—apart from the channel suffix (L and R). If you rename one channel of a split stereo audio file, the other channel file is automatically renamed as well. This also applies when renaming regions associated with the files.
File edits performed in the Sample Editor apply equally to both files.
If you use the Add Region command to create a new region, Logic Pro does this for both audio files.
Any alteration made to either region is automatically mirrored by the other. This applies to region start point, end point, and anchor position changes.
If the region of either file is moved into (or within) the Arrange area, the other region is also moved.
Both sides of a split stereo file are normally edited together. On occasion, however, you may need to edit one side individually.
Select (either side of) the split stereo file in the Audio Bin.
Choose Edit > Disconnect Selected Split Stereo File.
You can now edit both sides of the recording as individual mono files. This function only disconnects one split stereo file at a time.
Important: If you want to reconnect the files, don’t define any new regions.
Choose Edit > Reconnect All Split Stereo Files in the Audio Bin.
Logic Pro reconnects all disconnected stereo files in the project. Only files that were previously part of a split stereo “pair” are reconnected.
You can convert two (split stereo) audio files into an interleaved stereo file in the SDII, AIFF, or WAV format. This is useful if you want to use a split stereo file in another application that only supports interleaved files.
Select the audio files in the Audio Bin.
Choose Audio File > Copy/Convert File(s) from the local menu (which is also available by Control-clicking the Audio Bin or using the corresponding key command).
Choose Split to Interleaved in the Stereo Conversion pop-up menu.
Type in a filename, browse to a folder location, then click Save.
Note: This only works for split stereo files. You can’t use these commands to combine two mono files into a stereo file.