So, I had this issue with v1.3, but I have upgraded and my previous settings don’t work.
Audio via airplay is not in sync. To solve this, you have to add a buffer value in shairport
sudo nano /etc/init.d/shairport
enter -b VALUE in the command line
However, I can’t get mine to sync after ages trying. Restarting the device is annoying to say the least. Is there a way to work out what buffer value I need without trial and error?