Bounced Audio DOWN -1 SEMITON??

[Brian in Charlotte]

Folks, I am baffled and shocked. After bouncing voiceover audio, the file is somehow dropping the pitch -1 Semiton and I don't know why...I checked files from yesterday and they are pitched up +1 Semiton. While I was recording it was fine and playback was fine within the session, but after bounce and after closing the session it is messed up.

I never used pitch shift or any plug-ins at all on today's recording...any ideas.



PowerMac G5 Dual 2.0, 10.4.11, LE 7.4, 3 Gigs RAM, Digi 003R w/Black Lion Tweakhead.

[cneal92]

Sounds like the classic mis-clocked audio problem, which usually occurs when you set a session at one sample rate (say 44.1k) and you are bringing in audio via s/pdif and the mic pre is set to 48k. While you're recording and playing back with the mic pre connected it will all sound fine, but the minute you disconnect the mic pre, you will notice the problem. There are certainly other ways that you could create a clock problem.

If you could provide some more details about what you were doing and your specific setup, we might be able to spot the specific problem.

[Brian in Charlotte]

Chris, thanks so much. I was simply recording voiceover for a client and used no plugins except to normalize the audio. As I was cleaning the audio up it was playing fine. Then, I bounced all the files and started to send the by FTP. Then I thought..."let me make sure these versions are warmer in tone than the originals" (the client changed the scripts and wanted to go with a warmer/friendlier read). I pulled the original audio clip into the session and the pitch was higher. After freaking...I listened to the bounced files and found they were a lower pitch. It is a difference of 1 semiton (approx.) between yesterday's files and todays.

I just did a test and it appears to be working fine...VERY disheartening and makes me lose confidence that all will be well.

I completely track with you on your description in terms of sample rate discrepancies. I have the session set at 24/48K WAV. I am using the 003R with the Black Lion Audio Tweakhead Modification and Internal Clock.

Does this help?



PowerMac G5 Dual 2.0, 10.4.11, LE 7.4, 3 Gigs RAM, Digi 003R w/Black Lion Tweakhead.

[Sparky1]

You say your session is set to 48K - but each time you listen to it - is that machine capable of playing/set back at 48K?

Sparky1

[Brian in Charlotte]

Originally Posted by Sparky1

You say your session is set to 48K - but each time you listen to it - is that machine capable of playing/set back at 48K?

Sparky1

Sparky, good question...sorry for any confusion. I played it back in my Pro Tools session so it should be OK??

[lwilliam]

Your session is probably set to 48K, but you're bouncing to 44.1K - using built-in sample rate conversion. That's what it sounds like. Check to make sure you aren't converting the sample rate when you bounce.

If there's something weird with the Black Lion conversion re SRC, then another option would be to bounce to a track instead of bounce to disk. Simply set all your track outputs to a buss and route the output of that buss to a new audio track. Once bounced to a new track, you can simply "export region as file" and know that it will stay at 48k.

[Brian in Charlotte]

I will look at that William, thank you. I'm waiting for some audio to finish bouncing now and will review.


Brian in Charlotte
www.VoiceOverForYou.com

PowerMac G5 Dual 2.0, 10.4.11, LE 7.4, 3 Gigs RAM, Digi 003R w/Black Lion Tweakhead.

[shawnmarierx]

I have Pro Tools LE with and MBox.
When i bounce to a .wav file it consistently plays back at a pitched up rate.
The session is 48khz and 24bit rate, the clock is internal.

I have bounced at 48 Khz with 24, 16 and 8 bit rate depth.
As well as 44.1khz with 24, 16 and 8 bit rate depth.

Each .wav file when played in ITunes is pitched up.

What else can be causing this pitch shift?
Thanks, Shawn