Here's my setup: BBB, USB DAC, TuneBlade (system wide Airplay client), and the latest RuneAudio build. I have the TuneBlade settings set to the minimum buffer sizes (0). It takes ~2 seconds for audio to pause (and a similar amount of time to play, but that's not really an issue IMO). The bigger issue I have is that audio from video playback (YouTube, Netflix, and occassionally VLC) is considerably out of sync (probably by about 2 seconds...). This makes watching videos with people talking virtually worthless.
Is there any way to fix/dramtically reduce the lag on my setup (or suggestions for a better setup)? I really like the idea of having an external device play my audio, and then connect to it over my network. Any help/suggestions would be appreciated.