HELP- Video Sync Prob!!! Why is audio repeating like a never-ending delay?

Hello- I have a modest system: I am using Logic 7.0 on Mac OS 10.3.9,
M-Audio FireWire Solo Audio Interace, NO external sync device. I have just
tried importing a Movie as Float (Quicktime Movie: .mov) and I get this
HORRIBLE repetition of the audio from the video that WON'T stop! Also, ANY
audio that I actually have in the session as well follows this same
repetitive pattern. I have tried EVERYTHING: changing sample rate, frame
rate, (the video is 29.97), bit depth, unchecking 'contiguous sync'. It may
be of interest to note that the speed of the repetition changes when I change the Sample Rate, although this may be unrelated. The video's audio is Sample
Rate of 48k. It also is of interest that if I try and change the system from
Internal Sync Mode to MTC, changing whatever I can find in the Preferences
sections to MTC, I can play the video without the repetition, but only by
pressing play on the VIDEO screen. If I try to press play from the Space Bar
or any of the key commands, (0 or Enter for some users), or Play from the
Transport Window, the repetition occurs as well.... this TV Spot is due
yesterday so I need help NOW! What the **** is going on?!?!?!?! I was told I
don't need to rely on MTC, that I could just use Internal... but that doesn't seem to be right and I still get the above issues with MTC when I try to use it- HELP!!!!!!!

Rohan,
Thank you for responding so quickly!
1. are you using a dv firewire bridge to play back video?
NO- I tried that too- converting my .mov to a .dv and switching to the DV FireWire bridge. Still got the loop.
2. what is the codec of the QT movie file? you can check this with QT by hitting apple-i.
I am not in a place where I can check this now, but I will ASAP.
3. have you tried running logic with built-in audio and then running the video?
I take it by Built-In, you mean something different than the "Core Audio" I am running from now? If so, then no, I have not. I will try this if I can figure it out- thank you!
4. are you running the sound playback of the video through the interface?
Yes- all sound playback is running through the audio interface. Otherwise I would have to take the Audio out from the headphone jack in the back of the G4 and send that straight to my speakers.
Thanks! I will send more info when I can get back to my studio!

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So, I am regularly having two problems (I wonder whether they are connected) that I cannot solve and am hoping someone can tell me if I am out of luck or if I need to do something or add something.
For example, because it happened again today. These are details about the file stuff:
Type:AVI
Bit Rate:133kbps
Dimensions:624x352
Audio format: LameMP3
Frame rate: 23 frames/second
Data Rate: 1131 kbps
Video Sample Size: 12 bit
Video Compression: XVID
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Hello:
Thank you Robert J. Johnston, the_wine_snob, Paul_LS and SteveGrisetti for your help so far.
So this is where I am at now:
Files all seem to be of the same type, so I will just say "the file" for the one I am working with right now.
Loaded file into VirtualDub. I like that program. Well done, whoever made it. Did some basic cutting of unwanted stuff. Saved as AVI. Saved both a Direct Stream Copy and a Full Processing Copy.
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Before I do any more editing work, I decided to save it (SHARE) in different formats to see what happens.
Goal: Looking for no audio sync problems. Best quality I can get with a 1GB file size limit.
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Saved as Windows Media: Do not "think" there are any audio sync problems; if there are, they are very subtle. Not crazy about video quality. Better than flash video option though still flickers between two types of qaulity (if that makes sense) . 52MB
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Why inserting audio creates a gap in my video ?

Hi,
I try to insert a short audio mp3 bakcground music in my work.
I try to insert it several times because it is short and I need it repeat.
So I insert it once at begining of my work. When I insert it a second time, it will create a gap between the end of previous audio piece, and its own end.
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Uglook wrote:
I try to insert a short audio mp3 bakcground music in my work.
I try to insert it several times because it is short and I need it repeat.
So I insert it once at begining of my work. When I insert it a second time, it will create a gap between the end of previous audio piece, and its own end.
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