Logic Pro X: Recording is changing speed?

The problem has nothing to do with Logic or the projects, it has to do with the sample rate of the audio system you're using.

You folks need to read the manual so this stuff won't be a mystery.

If you playback a recording that was made at 48kHz sample rate at Logic's default 44.1 the sample will sound slow, conversely if you playback audio recorded at 44.1kHz with the sample rate of your audio hardware at 48kHz the audio will be speeded up with a slight chipmunk quality. You need to know: 1. The sample rate you recorded audio and/or 2. The sample rate of imported audio.

If you're using your Mac's audio hardware (a $2 chip by the way) and you play audio outside of Logic, (a DVD, a CD, Youtube, Netflix..etc..etc.) your audio hardware my change sample rates to accommodate that audio, then when you go back to Logic the audio sounds slow or fast. Always know the sample rate you've recorded at, then check the Mac's audio hardware using Audio-MIDI Setup and make sure the Mac's sample rate matches

Logic's. I use a pro audio card (RME) that Logic has exclusive use of, the Mac's system audio uses the Mac hardware so there's never any conflict, plus the sound is infinitely more accurate using the RME.

Go here:

http://help.apple.com/logicpro/mac/10/

Search on: Sample Rate

This should clear things up somewhat.

The M-Audio/01v combo has been fine for the 7 years I've had it, using Cubase. Ran a PC with an RME audio card to the 01v before that. I was just about to take my Drummer track and run back to Cubase when the issue sorted itself out. I know the bit depth doesn't make a difference in pitch but it could cause a bug. I'm not about to fiddle with the word clock master now that its working. That's a last resort.

This is a snapshot of the corrupt project with the Preferences/Audio pane open. That track along the top of the project should have no gaps. The pane has no adjustment for Sample Rate.

I had this happen too. I haven't had it lately so I am giving credit to the latest updates. 10.02 seemed to make the difference. I also stopped using a 64 sample buffer size. I used to try and reload after restarts and shutdowns and sometimes that worked, other times, running some regular system audio brought things back.

Even the software instrument tracks were playing slow and the regions that held the audio shrank to where there were new spaces between them. That let me immediately recognize the situation when I loaded the project.

At one point I actually reverted to an older version of the project and rebuilt it by dragging new parts in from the corrupt project.

Good luck.

Pancenter wrote:

The problem has nothing to do with Logic or the projects, it has to do with the sample rate of the audio system you're using.

You folks need to read the manual so this stuff won't be a mystery.

It's still a mystery.

My Yamaha 01v mixer is set to 44.1KHz. Its SP/DIF in/out is going to the M-Audio Audiophile USB's SP/DIF. If any digital audio goes to the mixer that is not 44.1, it will sit there and complain that the digital input is out of sync and not play a peep. All the audio clips in the project Media Browser say that they are 44.1KHz files, so why are they playing slow?

Going through Logic Audio Preferences, the M-Audio Control Panel and Preferences/Sound and I don't see an option to change the sample rate anywhere. I guess they know they are locked in.

I still have that corrupted Project and I can open both at once, click from uncorrupted to corrupted and they both play that way without ever leaving Logic. That is how I rebuilt the Project.

The key to the mystery may be that some of the bounces that I've done (i.e. the drummer track) came out 16 bit and the project audio was recorded at 24 bit in both Cubase and Logic. I cleaned out the other tracks in the uncorrupted version, but I'm sure they played nicely together at one point. The Cubase files were exported as 24bit Broadcast Wave files.

Anyway, I think it is still a mystery and I'm just glad it has stopped.

I'll try setting the system to internal audio for a while, even if it can be a pain having 2 sets of audio controls. Cubase never had an issue with it in the last 15 years.

Thanks for your input.

Rick..

The bit rate is not related to samplerat so bit rate (24/16-bit) won't change pitch.

Explain your digital setup with the 01v and M-Audio.

The M-Audio is the only audio interface plugged into the computer, correct.

The 01v is into the M-Audio via s/pdif?

The place to change the sample rate in Logic is under Settings/Audio (at least it is in Logic 9)

One problem I see in your setup. You have two way communication vis s/pdif between the 01v and the M-audio.

Depending on how you using the 01v only one of the cables is unecessary, however, the main problem is which digital clock is the master. When using digital devices there can only be one sample clock. If data is flowing from the 01v to the M-Audio then to the computer... the 01v should be the master and the M-Audio should be set to external sync, only a single cable from the 01v s/pdif Out to M-Audio s/pdif In should be used... if data (audio) is flowing From the computer to the M-Audio then to the 01v the M-Audio should** be the master clock with the 01v syncing to external digital clock (via s/pdif) The clock signal is in the s/pdif stream.

A single cable from the M-Audio s/pdif out to the 01v s/pdif In the 01v set to external digital clock.

** you may be able to use both s/pdif In/Out cables connected but you will need to set one device as Master, I've never known this to work well but depending on the devices it might.

The digital clock thing is important and could be part of the problem.

Ok, so you're good with the digital clock.

You're looking at Preferences... audio sample rate is in "Settings"/Audio (in L9) that's a different set of song adjustments that are on a "per song" basis... Preferences are Global for all projects.

That was it! It was set to 48KHz!

In italics. If that means something.

The only mystery now is how did I change it? Well, as long as I can change it back. I go forward into the LPX world with a little more confidence.

I don't know how the 01v played it when its clock is definitely set to 44.1.

Thank you so much for hanging in there with me on this.

All the best.

Rick

That pref pane was more legible when I was previewing it. Here it is.

Ed043 wrote:

I appreciate your input and I promise to read the manual cover to cover this week.

That's crazy talk! :-)