A possible workaround this would bet to do all your animations, add some visual reference for sync at the beginning of a project, or insert one second and add a prop that is only visible for one second then add a one second tone, beep or whatever suits you to your audio, then mixdown all your vocal tracks to one track, insert that track into iclone, sync the tone with the prop and remove the duplicate tracks if visible/possible then you should hear all your characters talking, in sync with the audio.
note: this method could require some tinkering or more steps depending on how your scenes are setup, but the principle is this: have a reference for sync in both audio and video, think of tv color bars, mixdown all vocal tracks to a single file, remove the old audio files, add the new file to a prop or as background music. This way you can have it all inside your project for further tinkering of animations. And if your daw allows it set your framerate to 60, this will give a 100% accurate time code, if not stick to 30 fps this will give a timecode that is accurate to the second, but frames will need to be multiplied by 2 in order to calculate the exact time code. Remember timecode is the best friend of picture editors and post production sound engineers.
hope this helps.
ps, rendering the video before mixing down all tracks can help you to sync the reference audio but remember that you daw must run at the same framerate as your video, or your audio will end up drifting after a while
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