Time Stretch Problem!

Using Logic pro 9.1.5 I Noticed that when I'm time stretching a track. Once finished, The Level of the track is 3db or more lower than the Original Level !!!! Does anybody know why this happens and if there is anything to do to fix this?

Well, audio is not exactly like a rubber band, I guess it all depends on the harmonic structure of your audio and the way the stretch algorithm manipulates the data, but my knowledge of digital audio processing doesn't go deep enough to fully explain this. The way I see it is that these algorithms have some sort of safeguard feature preventing the level going up - which I imagine could also happen, given the complex interactions of sound etc etc. A rubber band behaves much more predictable - it's the same basic stuff, reacting in a way that requires very simple mathematical formulae. Audio is much more varied an complex than latex.
What you could do, purely as "scientific" exercise, is to create a 30 second audio file, consisting of a constant sinewave at 1 kHz at, let's say, -6 dBfs, and see how that behaves levelwise when stretching it (try both stretching it longer AND shorter ("negative" sretching).
You can use Logics' Test Oscillator insert effect for this, it's in the Utilities section of the plugins.
To me it would make sense that these algorithms are somehow erring on the safe side - the one thing that you wouldn't want is the level to go UP and possibly clip your audio. But again, I don't know, just trying to use logic...

Similar Messages

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    I think it's one and/or the other.. I know compressed files cause problems but I also think it might be a permissions issue of some kind too...
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    http://documentation.apple.com/en/logicpro/usermanual/index.html#chapter=11%26se ction=4
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  • Graphical Time Stretch Problem/Bug??

    Hello.
    I've dragged a region of audio from the audio bin on to an audio track in the arranger. It is a kick drum track.
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    Thanks,
    - Justin.

    Hi there, this isn't a bug. I'm going to guess that there's a problem with your kick drum.
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  • Anyone besides me having problems using Time Stretch/Compression?

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    I know exactly where you are coming... this is 'normal' and everyone has the same problem..
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  • Time stretch has stopped working in Premiere Elements 13.

    I've downloaded the latest Adobe updates. I am using a Windows 8 64 bit computer. I have previously (in the last few weeks) used time stretch to speed up and slow down without any problems but now I can't get it to work in any of my projects. All video files shot with an iPod Touch or iPhone. Has anyone else had this problem? Any ideas on how to fix it?

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  • Time stretching a piece of audio in LE7

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  • Time Stretch Audio in FCP?

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    Hello Mr. Wolsky,
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    Hunt

  • Time Stretch Without Ripple APE-11

    APE-11
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    Phil
    Please give the following a try while I think about alternatives.
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  • Clips shift position on timeline when using time stretch

    Premiere Elements 10, Win 7 x64,
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    I have attached three images to make what I am experiencing more clear than perhaps my words describe above.
    (top) Image 001: timeline before any change
    (middle) Image 002: timeline after adding video track 5 and adding a still image to that track
    (bottom) Image 003: timeline after applying time stretch to the still image clip on track 5, showing shift of clips on tracks 3 & 4

    When Adobe was designing the operations on the PrE Timeline, it was determined that the majority of users WOULD want the Ripple. That does seem to be the case. The addition of the Ctrl/Cmd modifier key accommodates those users, or those instances, where the Ripple is not desired.
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  • Prevent time-stretch when changing BPM

    Hi there,
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  • Time stretch help please. These manuals are a PITA..

    Hi all,
    Well first a minor rant about the documentation with Logic Pro 7, for some reason no matter what task I need to perform I look into the reference guide and the plugin reference which are the two main books supplied with this application and all these books do is lightly discuss the the function of what you are researching.
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    I actually stumbled onto this once, but whern I try and review how to actually do this in the manual all I get it some very vague info that it can be done, unfortunately it just does not say how lol...
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    1. How the heck do I perform this form the arrange window.
    and
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    Cheers!

    If they are looking for another Algo then how else can you explain that comment?
    I'm sure if and when the OP has a problem with the sound of the algorithms in logic, he'll say so. for now, all the questioning has been about how to get a technique going where you can get your audio to the tempo you need it quickly and effectively in logic. we all know other apps like cubase and nuendo have more intuitive ways to do this right in the arrange window, but you can get a decent workflow going in logic as well. I don't have the time to get into it now but will try to post tomorrow.
    I read that some suggest that its wise to buy a 3rd party pluggin like Izotopes?
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    I have more technique I use if you're interested in hearing more, let me know as I haven't the time to go into it now. btw, if you use loops a lot and need to be able to control the groove and feel of audio files often for the music you make.. you should look at melodyne. there's an AU plug in version now that works very well in logic. I use it all the time.. most people know it as a pitch correction thing and just think of autotune when they think of it.. but it is an absolutely awesome tool for working with percussion and loops as well.
    as a matter of fact, melodyne plug in could be just what you need. it gives you total control of the timing of audio, so you can regroove anything, shift stuff around, quantize the audio, and your loops will follow tempo once they've been melodyned. I used it recently on a project that had lots of badly played percussion loops that were sloppy and loose. fixed everything in no time, while keeping the groove. and in the bargain it sounds better than the timestretching algorithms in logic too.
    go take a look.

  • Time stretch audio file to match tempo of track

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    Lennysapple wrote:
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    Hi 
    Seems to work OK here
    Lennysapple wrote:
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