Hey everyone,
Well, it has been like 6 months but I finally tested my sync button :P
Long story short... the tact switch for the sync button works!
Unfortunately while trying to solder wires to it I broke 2 of the 3 pins off, making it useless. Luckily I had a spare semi-broken Xbox 360 Guitar Hero controller that I grabbed the sync button tact switch from :P
This sync button only has 2 leads on it. 1 goes to a ground, the other is the signal to the motherboard; does it matter which pin goes to which? I'm guessing not, because they just connect and ground out anyway.
Anyway, I just wanted to give an update and share some info that might help others