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protools plays back late

Discussion in 'Pro Tools' started by niclaus, Mar 7, 2016.

  1. niclaus

    niclaus Active Member

    Dear fellow members,

    This weekend i was tracking guitar and i came across something really weird.

    We overdubbed guitars over some drums track and while we were recording, every takes (well almost) sounded good and on time. But when we hit playback, everything was out of time...
    So i spent a lot of time moving regions forward.

    So This morning, i did some tests, and i found out That if i want to listen to what has actually been recorded, i had to close the session and open it again.

    To say it differently, while we record everything sounds fine. Then You listen back and the guitars Sound late. Close and open the session again. Guitars Sound perfectly has they were recorded.

    I tried on a PT9HD rig as well as a PT10HD.
    I tried on two different mac.
    I tried with or without delay compensation.
    I tried in punch mode as well as in normal mode.
    Nothing seems to fix this issue.

    Anyone had already encountered this?

    Thanks for your help.

    N.
     
  2. DonnyThompson

    DonnyThompson Distinguished Member

    Have you made any recent changes to your system - new software, security updates, anything?

    You didn't mention if you've been able to record in the past without difficulty, or what audio i/o you were using, or if you were Mac or PC, or what your latency/buffer settings are for both recording and playback.... the more info you can give us, the more we can help you without "guessing".

    It's been years since I was a Pro Tooler... it sounds like it could be either a recording or playback latency ( maybe both) setting to me? Also, do you have any other audio drivers - other than the one for your primary interface - resident anywhere on your system? Maybe a driver for an older interface you may have had in the past still resident and active, or, a built-in sound card perhaps? You'll want to check and make sure that your current primary i/o is the only one enabled on your system...

    Also, have you checked for bug fixes/patches for your version of PT, or for updated drivers for your audio interface? Both software and firmware if that applies...
     
  3. niclaus

    niclaus Active Member

    Dear donny,
    Thanks for your answer.
    No we did not do anything on That computer. (but as i said i tried on another computer and the same thing happens).

    We are using a mac pro 2.8 ghz octo intel.
    We were recording mics into Neve 1073 into avid 192 interface.
    We use a magma extension chassis for pci cards.
    2 core and 1 process cards.
    Buffer set @128samples (cannot go below That when using 2 dsps)
    Playback buffer on level 2(default)
    Plug in buffer on level 2 (default)


    As for the differents i/o, are You talking about playback engines?
    If so i do have severals (built in audio,...) of them but only ever use the HD TDM.

    But again, same thing happen on 2 different systems, and on 2 different macs.
    I even tried on a hdnative rig. Same thing.

    Honestly, i can't tell You if That happened before, but i sure did not noticed it before.
    The delay is quiet low but This weekend i was working with a really tight guitarist. Tight enough That when he was doubling tracks,You could feel almost phasing between the already recorded take and the one he was doing. But once You play it back, not That tight anymore.
    Close and open session.
    Tight again...
    We are talking small differencies but still...

    Does That help?
     
  4. Kurt Foster

    Kurt Foster Distinguished Member

    have you inserted any plugs on the tracks /channels? are you running any plugs on the 2-bus? either one of those will create latency.
     
  5. niclaus

    niclaus Active Member

    When i first noticed it, i did have some plugins on some of the tracks (not the master though).
    I took them out to see if That would change anything but it did not. I still had the same problem.
     
  6. Kurt Foster

    Kurt Foster Distinguished Member

    the problem is latency on playback, not recording. if the plugs are inserted on previously recorded track while you overdub, removing the plugs on playback will not cure the latency. the damage is already done. the only remedy is to slide the overdubs back into line with the other tracks.

    plugs introduce latency because it takes a few milliseconds for the computer to do the math. never use any plugs as you are recording unless you are tracking the plugs to tape.
     
  7. niclaus

    niclaus Active Member

    Yes i know That.
    I meant, i took the plug ins out and then did another take but i had the same issue with or without plugins.
     

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