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Logic X Stereo to Two Mono

Discussion in 'Logic Pro X' started by bayswater, Oct 11, 2015.

  1. bayswater

    bayswater Senior member

    What would be the fastest way to split/convert a few hundred stereo tracks to mono. I can route them through busses and auxes to new tracks and record them but that gets a bit tedious with hundreds of tracks.
    I suppose I could export as non interleaved and then do a batch filename change,but is there a more efficient means within logic?
  3. EdgarRothermich

    EdgarRothermich Senior member

    There are many options and it depends on your setup and your needs which one you use:

    Here are four places where you can switch to Mono:

    Make it Mono
    the first step is to merge the 2-channel stereo signal into a mono signal

    1 - Input Format
    When you have stereo Audio Regions on a Track, you can set the Input Format (the circle buttons) on the Input Button to Mono. That merges the signal to mono. Using the File➤Export➤Region to Audio File will create a mono file.

    2 - Audio FX Plugin (Mono) on Channel Strip
    If option 1) is not possible because you have stereo Plugins on that Channel Strip that you want to keep, then you can add the Audio FX Plugin "Gain" at the last slot of the Channel Strip and set it to Mono. Now the Channel Strip has a two channel mono signal at its output. If you need that Gain Plugin on multiple Channel Strips, then keep in mind that you can with select all the Channel Strips and load a Plugin on Channel Strip and it will be loaded on all selected Channel Strips (Ad-hoc Group functionality). Or, you can load it on one Channel Strip, make the setting (switch to mono) and then option drag that Plgin to other Channel Strips.

    3 - Audio FX Plugin (Mono) on Output Channel Strip
    If you don't want to create individual Plugins on all the Channel Strips, You can also add the Gain Plugin on the Output Channel Strips and set ti to mono.

    Once your signal is merged to mono, you have different options to export/bounce it to mono files.

    A - Export Region
    You can use the File➤Export➤Region to Audio File command on individual Audio Region when you use option 1 and 2

    B - Bounce Stereo Output Channel Strip
    Use the "Split" option in the Bounce window and it will create two separate mono files for the left and right output channel, which are indentical at that point. Just use one of the files and toss the other redundant one.

    C - Bounce Mono Output Channel Strip
    With this procedure, you click on the Input Button of the Output Channel Strip. It toggles it between stereo (two circles) and one (one circle). Now you have two separate Output Channel Strips (one for the left output channel and one for the right output channel). the cool thing is that both Channel Strips have their own "Bounce" Button, when you use that button, you create a single one-channel audio file for the signal routed through that Output Channel Strip. I demonstrate that functionality in my new book "Logic Pro X - Tips, Tricks, Secrets #1".

    Here is a screenshot from that section
  4. bayswater

    bayswater Senior member

    Thanks Edgar, but I don't want to merge the two channels to a mono file. The two channels are different unrelated tracks but were delivered to me as stereo files. Basically I have 224 mono tracks from a tracked album delivered as 112 stereo tracks. I can split them one ata a time but hoped there would be a fast way to do it.
  5. EdgarRothermich

    EdgarRothermich Senior member

    I see. The only way I can think of is use the "File ➤ Export ➤ All Tracks as Audio File" command

    • Create two Audio Channel Strips
    • Set the Input Format of the First Audio Channel Strip to "Left" (Control+click on the button and select it from the popup menu) and set the second Audio Channel Strip to "Right"
    • Now select both Tracks and option+drag them down, which creates 2 new Tracks with duplicate Settings
    • You have to do that 111 times to create the 224 Tracks. You can use a trick and select-copy bigger chunks of Tracks the more you created (drag 4, drag 16, drag 32, etc)
    • Now import your 112 Audio File, where you put every Audio File on two adjacent Tracks (one set to Left and one set to Right)
    • If now all the Audio Region start at bar 1 and there is only one Region on each Track, you can use the All Tracks as Audio Files command, and Logic creates this 224 split mono files.
    If you spend some time in the Finder, properly naming the Audio File before importing them, then Logic will place them correctly on the Tracks and you can use the Export command and you are done in on step. What I mean is, duplicate all the 112 files in the Finder and add an a letter or two to the file names ( you can batch rename that in the Finder, ctr+click on the selected files and choose "Rename", or you can use the Automator app for more detailed operations). This way the Audio files and their duplicates are listed sequentially when you sort them and are placed correctly when importing them into Logic. Does that make sense ?

    Here is a slightly different procedures for Logic.
    • Import the 224 audio files and let Logic create the 224 new Audio Tracks.
    • Now use the "Ad-hoc Groups" feature. That means, you select Channel Strip 1 and every other Chanel Strip in the Mixer. Changing the Input Format on one Channel Strip to "Left" will change all those selected Channel Strips to that format
    • Now do the same thing for the even Channel Strips. Select Channel Strip 2 and then every other Channel Strip. Select Input Format "Right"
    • Use the Export command and you are done.
  6. bayswater

    bayswater Senior member

    That's close to what I did to split the first track. It worked. But I think I'll see if I can come up with an approach that does need to be repeated dozens of times
  7. sonnykeyes

    sonnykeyes Senior member

    You don't have an old running copy of Logic 9 do you? If so, try unchecking "Universal Track Mode" in the Audio Preferences and importing your files. It should split them all on import, then you can copy them into your Logic X project.
  8. bayswater

    bayswater Senior member

    I don't have 9 installed any more. Looks like de-interleaving and detect silence is a pretty simple way to go.

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