Help with a sample rate/speed experiment

[GeneralDisarray]

When you start a project and import an audio file, if it's at a different sample rate as the project's, it will ask you if you want to convert the file to the project's sample rate, or if you want to change the project's sample rate to match that file. If you choose the latter, and then you change the project's sample rate to anything else, then the file will play back at a different speed, because you changed the project's sample rate, not the file's.

For example, if I start with a project that can be 48 Khz, and I throw in a 192 Khz file, it will ask me that, so let's say I choose to change the project to 192 Khz. If later I change the project's sample rate to 48 Khz, the file will play much slower.

It is with that in mind that I wanted to do something like that because I'm trying to take apart a song that has a great electric guitar solo, which at certain parts speeds up to several notes a second. So I did the steps I described above.

But the result was not was I was expecting, and I tried this twice, so I'm not sure if it's a bug, or a limitation of some kind.

What happens is that once I set the project to 48 Khz, I see the file, and it plays much slower as expected. The problem is that it's also trimmed to about a minute. I figured I'd just have to click and drag the right side to show the rest of the song, but it doesn't let me move it one bit.

Strangely enough, if I click and drag to the left to shorten it, I see this weird effect where the right edge of the song gets trimmed much more than the distance I'm dragging. Hard to explain, so here's a screenshot:

And then, I can't even drag it to the right to go back the length that it had before I clicked and dragged to the left.

So, is this intentional, or just a bug? Basically I'm just trying to slow down the song a lot, and I don't know if this method is better than just throwing the original 44.1 Khz and using the flex tool. It's just an experiment I wanted to try. I converted the file from the original to 192 Khz 32 bit in Audition CS6 (yes, I still have that, only in my PC).

If I throw in the 192 Khz file into a 48 Khz project, is there a way to set it up so that it doesn't convert to 48 Khz (or whatever the current project sample rate may be), keeping the length that would be a 192 Khz track slowed down to 48 Khz?

And yes, I know this is probably absurd, but it's a learning tool for me.

 

 

 

[Jordi Torres]

Hi @GeneralDisarray,

I confirm the behavior you're seeing and it appears to be a bug introduced in Logic Pro 10.5.x, because in Logic Pro 10.4.8 the region length is updated to match the length of the audio after the sample rate change.

What happens in Logic 10.5.x and newer is that the region length remains fixed to that of the audio file at the original sample rate. A workaround is to open the Audio File Editor. There you'll get the full duration of the file post sample rate change.

J.

[Jordi Torres]

8 hours ago, GeneralDisarray said:

Strangely enough, if I click and drag to the left to shorten it, I see this weird effect where the right edge of the song gets trimmed much more than the distance I'm dragging. Hard to explain, so here's a screenshot. And then, I can't even drag it to the right to go back the length that it had before I clicked and dragged to the left.

For that you can resize the region from the Project Audio Browser, but that still won't give you the full region to match the new length of the audio after the sample rate change. You'll only get the region to match the duration of the file at the original sample rate.

And just for comparison, here's Logic 10.4.8 versus Logic 10.7.7:

J.

 

Edited February 26 by Jordi Torres
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