Um, yes it does…
Does it really? I noticed in the Fire-Lite manuals, it always said “strobe synchronization”, so I assumed it only synchronized the strobes. I was going to test this on my system, but I ended up just putting up one strobe.
Really, it does do that! Try it sometime. 
All this time I’ve been thinking of ways to have one NAC for the audibles, and one NAC for the visuals, lol. I was mislead by the labeling of the MS-2 DIP switches.
since all of the alarms i have are two wire i use slective silince turned on all the time
I wasn’t talking about selective silence, I was talking about having audibles on a separate circuit so I could synchronize them.
I know i was just saying that lol