Lip-syncing of separate characters is easiest when each character has their own separate audio track with their own dialog isolated. This is easily done in any free audio software, and the tracks are easily loaded into Iclone. However, once the audio is applied refining lip-sync can be hampered just because the other tracks are audible.

I doubt anyone expects a fully fledged audio mixer from Iclone, but two functions would make life so much easier.

1 - A simple audio toggle for each track (character) would make this easy to avoid.
2 - Exporting audio as separate tracks (with or without video) would make post-syncing and mixing easier.