Crossfading two audio tracks in Logic?

Discussion in 'Digital Audio' started by salientstimulus, Sep 13, 2009.

  1. macrumors member

    Jul 3, 2009
    This might be a stupid question, but I haven't figured it out yet, and it seems like there's probably an easy method.

    I recorded an acoustic guitar part with two microphones (one close and one further back), and I'd like to find a way to smoothly crossfade between them. I've previously used automation to control wet/dry signal from effect plug-ins, which was easy, MIDI-controllable, and non-destructive. Is there a similar way to control A/B signal using the automation system?
  2. macrumors 6502a


    Feb 20, 2009
    Switzerland, ZG
    Did you check out the Crossfade tool in Logic Pro ? Just search in the manual, there is a how-to .
  3. thread starter macrumors member

    Jul 3, 2009
    The crossfade tool (at least as far as I understand it) seems like kind of a pain for what I want to do. I'm hoping to have two tracks that are played for the entire song, and smoothly change the balance between them over time (i.e., more room sound at some points, more proximity effect-bass at other points). Basically, I guess I'm hoping there's a way to use automation to control both track faders in opposite directions (like a DJ's crossfader or wet/dry knob).
  4. macrumors 6502a

    Aug 6, 2007
    Check the manual for how to do automation. Click the "a" button the keyboard to get started. You'll be able to either draw it in/use breakpoints or record fader moves. Just change the volume automation for the tracks in question.
  5. thread starter macrumors member

    Jul 3, 2009
    Sorry, I think I was unclear. I'm familiar with how to use automation, but I was wondering if there's a way to set an automation parameter that controls A/B mix between two tracks (maybe using a bus channel?). The alternative is drawing curves for both tracks, which means doing some math/tweaking to maintain the total output of the two tracks (A+B) at a constant level as each individual track changes.
  6. macrumors G4

    Jan 5, 2006
    Redondo Beach, California
    Could you "fake it" by using pan? Pan, I think keeps L+R at a constant level. Then when you are done just ignore one of the stereo pairs
  7. macrumors regular

    Apr 1, 2009
    I saw a way to copy and reverse automation data on a video in the TNT2 series at macprovideo. I think this may help...

    Draw / record volume automation or fades on track 1.

    Open the Automation Event List (key command only. Look in KC window)

    Now Open a new Arrange Page. The new page will show region automation regions.

    Copy the automation region to the other track.

    Select it and open the Transform window and set the Conditions Status to Control data. Set the Data Byte 2 Operations to Reverse.

    Click on 'Select & Operate'.

    You now have a type of crossfade written as automation.

  8. macrumors member

    Aug 16, 2009
    maybe send the channels to an aux channel using the same bus. then use the autoomation to automate the send levels to each bus?

    I'm not a pro, and that was just off the top of my head

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