Mmmmhh *scratches head* that is weird, at this point i think i would need to see both the project and a render done in your computer to pinpoint the issue. 

Thanks Raxel_67  I've sensed this might be the case. The scenes vary, but normally I try to do everything in 30 secs blocks, however I have done much longer on occasions. As I'm doing the next project I'm going to closely monitor what's going on with the sound to try and work out specific examples.
Thanks for the advice.
Cheers,
Tony

How long are scenes tony?
I ask this because the longer they are, the drift in the audio will go from acceptable (hard to notice) to nightmare levels.  

The reason for this is that when you are placing audio in iclone you are working at 60 fps and your output will be in a diferent frame rate making the audio out of sync (the starting position of an audio file is determined by your frame rate). But luckily the drift is not going to be noticeable if the scenes are short since drifting audio is noticeable after some time, so if you make your scenes short the drift in audio will be minimal. And like i always say: audio in iclone is for reference only.

If you still have issues let us know.

Thanks Sonic 7, I ran several tests yesterday and discovered there was absolutely no difference in lip sync between the same scene rendered at 24, 30 or 60 fps, the mouth movement was identical. I also took a screen grab of a scene in Realtime and compared it to the final render and discovered that there were small variations in mouth movement and facial expression, but not sufficient to explain my sync problem. 
All the testing I did was with a single talking character with no scenery or props, I am also aware however that this problem is showing up in large scenes, with multiple characters talking and it may be that I am stressing out my PC (though unlikely).
The fact that the lip sync problems occur in the iclone render means it can't be the NLE as that only comes into play when I am correcting the problems. It seems to me that the problem is either in iclone, my PC's capability to process or operator error. I'll monitor this more closely on my next project, but typically I'm finding the lip movement is lagging behind the audio and so I have to drag sections of the audio forward, but the amount varies throughout the scene, so its not just a case of dragging the whole audio track forward.
 Once again, sorry this has wandered from the core topic of this thread, I'll make a new post when I have more info. Thanks for your comments.
Cheers,
Tony
    

Thanks for the instructions on video insert.

For some dumb reason I still use YouTube, even though this is how Google recommends my videos:

(This is from my current video 'The Worst Part of Censorship is...')

76% of original size (was 660x19) - Click to enlarge




Creator of the free website:
PixelDatabase.Net
A Free Online Text Based Image Editor
76% of original size (was 660x19) - Click to enlarge

Data Juggler (6/13/2019)

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How do you embed a video like that in a post?

Good to know about linear transition. I used Linear for everything, and Smooth sometimes.

Click on the "+ Insert" button, then the "Insert video" icon.
NOTE:  On the pop-up dialogue, there are buttons for YouTube, Vimeo, and Sketchfab URLs.  It defaults to YouTube.  Be sure to specify if you're using one of the others.

76% of original size (was 660x19) - Click to enlarge

Data Juggler (6/13/2019)

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to the person who recommended the John Hess video, while I am sure he knows more about film making than I ever want to know, he sounds like me and why the 8 track was really all the audio needs we ever needed.

24 FPS may have been great before WW2, but 60 FPS should be the standard by 2019.

That was me.
8-track... that's funny.  :)

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iClone 7... Character Creator... Substance Designer/Painter... Blender... Audacity...
Desktop (homebuilt) - Windows 10, Ryzen 9 3900x CPU, GTX 1080 GPU (8GB), 32GB RAM, Asus X570 Pro motherboard, 2TB SSD, terabytes of disk space, dual  monitors.
Laptop - Windows 10, MSI GS63VR STEALTH-252, 16GB RAM, GTX 1060 (6GB), 256GB SSD and 1TB HDD

I learn more just eaves dropping on the conversations here than my own video creations.

I didn't know I could export an image sequence instead of a video.

This way if I ever have to do I can do some touch ups on the image before rendering and / or change the render speed.

to the person who recommended the John Hess video, while I am sure he knows more about film making than I ever want to know, he sounds like me and why the 8 track was really all the audio needs we ever needed.

24 FPS may have been great before WW2, but 60 FPS should be the standard by 2019.




Creator of the free website:
PixelDatabase.Net
A Free Online Text Based Image Editor
76% of original size (was 660x19) - Click to enlarge

How do you embed a video like that in a post?

Good to know about linear transition. I used Linear for everything, and Smooth sometimes.




Creator of the free website:
PixelDatabase.Net
A Free Online Text Based Image Editor
76% of original size (was 660x19) - Click to enlarge

Ahh - OK - then based on a 60 fps "hard coded" clock, (meaning your 'editing settings' don't impact on your final 'output' settings), then any 'sync loss' *must* be due to your *NLE* settings ...


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Please be patient with me ..... I don't always 'get it' the first time 'round - not even the 2nd time! :(  - yikes! ... 

● MSI GT72VR Laptop, i7 7700HQ 4-Core 3.8 GHz 16GB RAM; Nvidia 1070, 8GB Vram ● iClone-7.93 ● 3DXChange Pipeline 7.81 ● CC-3 Pipeline 3.44 ● Live Face ● HeadShot ● Brekel Pro-Body ● Popcorn FX ● iRAY ● Kinect V2 ● DaVinci Resolve17 ● Mixcraft 8.1

iClone has an "internal rate" of 60fps, and that is hard-coded, so it shouldn't matter what "render settings" you have while editing.  Internally the project is always 60fps.  Then it's just a matter of which frames need to be exported to achieve your desires output fps.

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iClone 7... Character Creator... Substance Designer/Painter... Blender... Audacity...
Desktop (homebuilt) - Windows 10, Ryzen 9 3900x CPU, GTX 1080 GPU (8GB), 32GB RAM, Asus X570 Pro motherboard, 2TB SSD, terabytes of disk space, dual  monitors.
Laptop - Windows 10, MSI GS63VR STEALTH-252, 16GB RAM, GTX 1060 (6GB), 256GB SSD and 1TB HDD