Please do not worry about the high "chipmunk" or "anime" voice.
When the system detects that you are behind the others due to connection delays,
it starts playing the delayed audio at a slightly faster pace
(which is what you hear as a chipmunk) until it catches up.
If this bothers you, you can try these 4 steps below :-
1. Turn off your camera
2. Turn off your incoming video (click X on any showing video image)
3. Lower your Connection Speed
(click File on top left and select Connection Speed ) .
Lower this to [Up to 1 mbps].
4. If all else fails, please click [Audio] from top menu bar and select [Reconnect].