I found some info on Turtlebeach's website in regards to Audiotron:
AudioTron: Formats - lossless (wma9, ape, flac)
At present losslessly compressed formats (wma9, ape, flac) are not
supported.
2) Digital output must be 44.1 for .wav files, 48khz is not supported.
3) .wav files must be used with Ethernet, HPNA is not supported for .wav, (they said it doesn't have enough throughput).