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Matrix question

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Big Muff:

Hi all,

I'm creating a mix of 3.31.85 from the Oade and Miller sources.
My issue is that the tracks are different lengths- meaning I can sync the start of the 2 sources just fine at the start, but about 3 minutes in one gets ahead of the other creating an echo effect.
In the case of Music never stopped; the two sources start off perfectly synced- approximately 3 min in the echo effect - but then it starts to corrrect itself towards the end of the song.

What is a good way to correct this using wavelab 6?

opsopcopolis:
You’re going to have to time correct one of the files. Not sure how to do it 8n wavelab but there are tons of threads about this. Probably been discussed somewhere

nulldogmas:
Yeah, the basic principle is 1) place markers at two clearly defined points (loud clap, snare hit, etc.) near the start and end of each recording, 2) measure the distance between the two for each file, 3) divide one distance by the other, 4) use this ratio with some kind of pitch/tempo filter to either stretch or shrink one file until the two line up.

Though if you're saying that they get out of sync and then go back into sync again, this may be a more complicated problem than just two recorders running at consistent but differing speeds. Still, the above system should work, even if you find you may need to do it in multiple smaller segments rather than just one big stretch.

one8ung:
https://www.youtube.com/watch?v=MOz2GUdL_vw

morst:

--- Quote from: nulldogmas on July 16, 2018, 08:31:03 AM ---Yeah, the basic principle is 1) place markers at two clearly defined points (loud clap, snare hit, etc.) near the start and end of each recording, 2) measure the distance between the two for each file, 3) divide one distance by the other, 4) use this ratio with some kind of pitch/tempo filter to either stretch or shrink one file until the two line up.

Though if you're saying that they get out of sync and then go back into sync again, this may be a more complicated problem than just two recorders running at consistent but differing speeds. Still, the above system should work, even if you find you may need to do it in multiple smaller segments rather than just one big stretch.

--- End quote ---


Be careful of using an audience clap. Ideally, you would like to synchronize on something close to a stage microphone, or even the break music, in order to get the most accurate time-alignment.


If the sync goes out and comes back in, it could be that they are analog sources with much higher speed variation than we are used to on digital. If that's the case, it will be incredibly difficult to do this without resorting to something like Plangent Process which costs $$ and takes place on 192kHz transfers


Hm, Oade source is digital
https://archive.org/details/gd85-03-31.oade.connor.8244.sbeok.shnf


here's a digital miller source
https://archive.org/details/gd1985-03-31.139080.s2.pcm.sbd.miller.fixed.flac24


I guess watch for dropouts that would cause sync issues. But dropouts would not result in the end of the track coming back into sync.


Are you sure Dan Healy is not just fooling your ears with trippy sound effects?

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