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Urgent: synch problem

Discussion in 'Logic Pro X' started by peterlemer, Apr 29, 2014.

  1. peterlemer

    peterlemer Senior member

    My remote drummer says that my MP3 don't start at 1.1.1 and for the past two projects he's had to make slight adjustments to match the click.

    I checked by reloading the MP3s back into my own project, and bugger me.. they are out of synch.

    Any ideas why that might be?

    I thought that a bounce from any position would actually BE at that position forever after...

  3. peterlemer

    peterlemer Senior member

  4. gdoubleyou

    gdoubleyou Senior member

    Nudge, I guess so?!

    A better solution would be to use a full resolution audio file vs a file format that's encoded.

  5. Per Boysen

    Per Boysen Senior member

    I've never noticed any out-of-synch issues in long distance internet collaborations when bouncing from bar 1 and making sure the music is starting around bar 2. MP3 is not an optimal format for timing critical material since the files are not as time accurate as non compressed formats like wave, aiff and caf.
  6. peterlemer

    peterlemer Senior member

    gdoubleyou,Per: thanks. I've bounced the same selection to MP3 and Wave, re-imported them, and they are both out of sync with the original, and perfectly in sync with each other.
    I then tested by creating a project with a track of clicks, and re-imported the bounces. Almost perfect, though out of phase with all of MP3, wav. and AIFF.

    Then I inserted the factory 'Basic' set of output effects and repeated the exercise, and voilá! huge delay between source and original. I have never thought of this before, but the bounce of delayed material will of course start by that amount of delay.

    So now I am older and wiser, the question is: how do I send bounces /of a mix/ that will allow synced overdubs?

    1. Send the mix without output effects
    2. include a click so that the recipient can sync with their own click
    3. before sending, sync the bounce with the orginal myself and provide the offset.

    what does the panel do?

  7. Per Boysen

    Per Boysen Senior member

    Did you bounce with the locator cycle starting from bar 1?
  8. peterlemer

    peterlemer Senior member

    no, bar 3
  9. Peter Ostry

    Peter Ostry Administrator Staff Member

    Do you bounce offline?
    If yes, bounce realtime and look if there is a difference.
  10. peterlemer

    peterlemer Senior member

    yes, I tried bouncing in real time from bar 1 in different filetypes and my conclusion is: never bounce with output plugins if I want the bounce to be used for syncing remote performers.

    ... unless there's a setting which compensates for latency and looks ahead so that the output has none???

  11. Peter Ostry

    Peter Ostry Administrator Staff Member

    I tested this today and don't see the problems you talk about. Recorded a click and bounced it realtime/offline with/without a Linear Equalizer and an AdLimiter in the output strip. Both are known for latency and I had set the lookahead of the AdLimiter to 200 ms. Offline bounces had a different level (strange!) but there was no timing problem in any bounce.
  12. pfloyd714714

    pfloyd714714 Senior member

    A different level in an offline bounce? I gave up on offline bouncing while using Logic 9 due to odd glitches like tracks dropping out and complex automation being ignored. Real time bouncing takes time, but it's consistent.

  13. Peter Ostry

    Peter Ostry Administrator Staff Member

    Wait a moment, I remember beeing a bit sloppy with mono/stereo during the test. The original track was mono and maybe I switched stereo to mono for some bounced files which could be the cause for the different level.

    However, I could not produce timing problems, unfortunately. Peter, I do not now if plugin compensation has an input on the timing of bounces but you may check if your compensation is set to "All".
  14. peterlemer

    peterlemer Senior member

    Hi Peter: I had my compensation set to "Audio and Software Instrument tracks" - switching to "All" solved my problem. Thanks a lot!

    I could use an explanation, as the manual isn't very clear.

    I'm guessing that "Audio and Software Instrument tracks" exclused the Output channel but if so, I don't get (feel) why my bounces are delayed.


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