Mxsmanic wrote:
I note that the Baron (and presumably other twins) has a prop sync switch that
somehow synchronizes the prop speeds on both engines. From recordings I've
heard of the interior noise of the aircraft, it does sound as though props
that are just slightly out of sync can produce a very irritating intermittent
noise as they move in and out of phase. Is it very bothersome in real life?
Also, how does the prop sync work? Does it actually move pitch or throttle
levers or something?

If you type in prop synch multi-engine planes into the google search
window the first hit you will see is this
The AVSIM Forums - Viewing topic #736 - Prop sync
Out of synch propellers will not be as obvious or as annoying in a
simulator as in a real plane. In most aircraft with prop synch, you
first manually ...
forums.avsim.net/dcboard.php?az=show_topic&forum=189&topic_id=736&m ode=full
- 56k - Cached - Similar pages

Go there , read it and you will know all you want to know.