Trouble With Audio Coming Out of Sync

I am having trouble with audio sync
I am using .mov files of myself talking however I also record audio of myself talking as well. The audio files record as mp3 however I convert them to aiff files in order to better synch them in FCP
I have an audio sound as an in point in order to better sync them and the syncing is perfect when i start.
My files are about an hour and a half long and 20 minutes or so the audio starts to come out of sync and my mouth becomes a half second or so behind the audio. I record this audio live so there is no delay between my speaking and my recording voice but the longer the video goes the more out of sync I become.
My syncing method that I use is "Merge Clips" at the in points.
Has anyone else experienced this?

All sorts of things you can do.
Easiest fix is just to run down your timeline and every few minutes snip the audio and move it back into sync.
Now after that;""
Qe have no idea what your process was. We assume you're editing in Final Cut. How did you import your footage? What format is it in the browser?
what are the settings of your timeline? Look at the sequence settings.
You know that you can plug audio from
mic into a Zi8?
You need to get rid of the mixer hum. Likely ac electrical
interference , a ground fault, but who knows.

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just recently audio in big sessions is playing back out of sync ( vocals off beat) sometime by a little , sometime by a lot.
It starts after I have been working for a while. very annoying, even bouncing offlilne doesnt help once it starts!
My hd meter is very low, getting no warning errors, dap metter very low, set the i/o to 1026....
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I am running apollo twin with uad plugs also
any fixes for this?

All sorts of things you can do.
Easiest fix is just to run down your timeline and every few minutes snip the audio and move it back into sync.
Now after that;""
Qe have no idea what your process was. We assume you're editing in Final Cut. How did you import your footage? What format is it in the browser?
what are the settings of your timeline? Look at the sequence settings.
You know that you can plug audio from
mic into a Zi8?
You need to get rid of the mixer hum. Likely ac electrical
interference , a ground fault, but who knows.

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NVIDIA GeForce 7800GT:
Chipset Model: GeForce 7800GT
Type: Display
Bus: PCI
Slot: SLOT-1
VRAM (Total): 256 MB
Vendor: nVIDIA (0x10de)
Device ID: 0x0092
Revision ID: 0x00a1
ROM Revision: 2152.2
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Resolution: 1920 x 1200
Depth: 32-bit Color
Core Image: Supported
Main Display: Yes
Mirror: Off
Online: Yes
Quartz Extreme: Supported
HWP D5259A:
Resolution: 1280 x 768 @ 75 Hz
Depth: 32-bit Color
Core Image: Supported
Mirror: Off
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Drives from G-tech and Granite Digital are worth a very close look.
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x

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Try exporting the iMovie project as a single full quality dv format quicktime file.
I use iMovie6 HD and this is my usual procedure that works well.
Make the movie in iMovie, will involve many separate clips. When finished, export (share) as a single full quality dv format quick time file. When I have an hours worth of smaller projects, I create a new iMovie project and import all of the quicktime .dv files for each separate short project. I add chapter markers in this project, then share with iDVD. I then burn an hours worth of stuff at best quality and distribute to family and friends.
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Trouble With Audio Coming Out of Sync

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