I have my Due working with sound from a Galaxy Nexus but the quality is pretty poor. I put a 1KHz tone on my phone and played it through the Due and it quickly becomes apparent that there is something wrong. There are gaps in the audio which don't seem to be periodic. On the scope I see small gaps about a millisecond long. The gaps happen about every 100msec (or so). After the gap, the output continues at the same voltage which makes me think the dac might be sending the same value during the gap until more data is available. Anyone else observe this?