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New Audio Recording out of sync with Global Tempo Automation [SOLVED]


Toomerm
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I'm recording a rock song in Logic Pro 10.5

 

I am have my MIDI instrument drums Programmed

I went and automated the global tempo to the full project

 

Now I am ready to record the guitar parts.

Sounds perfect in the headphones and I hear and see the tempo moving in real time.

 

But when I play it back the audio is slowly coming out of sync or offbeat.

 

I couldn't get a straight answer from the other posts and all the youtube channels are based around MIDI only or importing audio after the fact.

 

I love Logic but in PT you simply set the tempo and play to it and done, next part. This seems way more complex for some reason.

 

I have no recording delay set and low latency mode is off.

I have no plugins yet other than the SSD5 drum instrument.

 

If I delete the tempo automation then it's perfectly in sync.

Not sure why it's playing back out of sync when it sounds perfect when I'm recording it. I'm speeding up and slowing down but the audio transients are visually moving out of sync.

 

I am recording at 44.1khz with my interface (Apollo Quad) also set to 44.1

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Yes Flex Mode is off for everything.

Is this one single audio region from the beginning of your project? Or multiple regions on the track?

 

Could you post a screenshot of your entire main window with that track selected, all the regions on that track selected, and the Region inspector visible? How to attach files to your post

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Sorry for the late reply; work has been super busy and late

 

Is this one single audio region from the beginning of your project? Or multiple regions on the track?

 

Yes, one full take/pass. It slowly moves off grid, but in the beginning it seems fine.

 

Could you post a screenshot of your entire main window with that track selected, all the regions on that track selected, and the Region inspector visible?

 

Here is a whole (partial) pass with me just plucking the strings on the downbeats.

At first they seem on grid but later on the start slipping.

 

1764577739_ScreenShot2022-01-17at9_04_24PM.thumb.png.c772b56c0ef9aa5d7b454a783a77eed8.png

Overview Look

 

Here it shows the transients on beat near the beginning (below)

2398858_ScreenShot2022-01-17at9_05_16PM.thumb.png.d75cdbfe0ab88e84af2cb0a56802996c.png

On Beat

 

Later in the song it has drifted/delayed

790398071_ScreenShot2022-01-17at9_10_13PM.thumb.png.096d49c0a7c406a3fd704dfda57909ec.png

Off Beat

 

Thank you for you help

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User "jomofo" concludes that it's a Logic Bug but has not been successful logging a ticket with Apple. This seems very odd to me as it seems like such a basic operation.

But also maybe I added in too many automation points, but again, that seem basic for the program to handle esp this early in the session.

I don't want to give in and delete the automation just yet but it seems there is no solution.

 

From user jomofo:

"Wow, okay, so it only took me an hour or so to redo my tempo automation using the Tempo Operations (Edit > Tempo > Tempo Operations...) window. It's not quite as user friendly, but at least I don't have to fight with the tempo curve handles like I do in the global track.

 

I changed most of my curves to just 1/4 steps up and down over a bar. I have a couple of bigger drifts where I felt like it needed 1/8.

 

It actually worked! The clock doesn't drift out of sync now.

 

I speculate there's a bug in whatever they're doing to calculate the tempo from those continuous style curves in the global track that is additive in nature. The longer you playback the larger the error becomes. I don't have a guess as to why certain settings tweaks seem to amplify the error and make it more noticeable sooner in the playback"

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So here it is: I gave in and deleted the crazy tempo automation points because maybe it was overkill and throwing things off...somehow.

I like to think I have a decent setup mac with 3.1ghz, 16g ram...apollo quad...yeah yeah

The little engine that could haha

 

I went and just added the critical tempo change with a basic slope up and down.

 

And that worked folks!!

 

Now I know why Steve albini hates digital systems lol

But also he wouldn't be using SSD5 to kick start a rock album. Sucks living in a small space with a head full of creative ideas.

 

So stamp it solved ...not really... but I'm moving on to actually do some tracking. Hope this helps someone

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Nice! Yes I thought about that at work today and came home and shifted everything to the 1st bar/beat marker position. Prior it was as far back as -3 bars or so.

But that didn't change things when I tried another recording pass.

If I keep the global tempo automation to only a few points I'm good for some reason.

 

Thank you for reaching out

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  • Solution

Ok so I figured it out.

I can use as many automation points as I want.

After you draw them in go to over to the side bar for tempo and select "apply smoothing"

It now looks more binary and swaps out the curves for stair steps but the sound and feel is still there....and most importantly the audio is 110% dead on.

Thanks for everyone's input.

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