Sorry I cross-posted this, but I realized this may be a bug.
When I try to stream from my laptop to Volumio with Airplay (through Airfoil) to my Meridian Explorer asynchronous USB DAC, the artist sounds like a martian! The sound is heavily distorted; a kind of nasal, scrambled sound with a high pitch. Otherwise, playing through the Volumio interface to the Meridian from my NAS works like a charm. Airplay works fine with my IQAudio i2s DAC.
Laptop: HP G72
OS: Windows 7
USB DAC Meridian Explorer