I have been using audio for the last two weeks on a project, and I haven't had any problems, even with multiple characters.
To me it works be to record a sentence or two, and then create a video file and put the video together in a video editor (I use Movavi, but there are plenty of others).
I understand the want for one long choregraphed scene in IClone, but smaller sections of about 1800 frames or less produces better results.
Every time I start a new set of dialog I will clear the object animation for the characters in question, and this clears any remaining vsemes or motions.
And last thing I do that helps sometimes is I take the video and mute the audio in my video editor, then add the audio file back on another track.
This allows me to increase or decrease the speed of the video segment for each dialog line spoken if needed, and it helps to solve sync problems.
Maybe that will help.
Creator of the free website:
PixelDatabase.Net
A Free Online Text Based Image Editor
