Try turning it on only after you've booted your PC. Or cycle the inputs once. Wiggle the volume control... That usually helped with mine.
Or just get rid of it (sorry, I'm currently pissed at the XEO).
When it works properly, it provides rather fast sound, which can seem very harsh at first. Sometimes though mine just won't work properly and that ~3dB channel imbalance really killed any further fun.
Are you using the most current drivers? DO NOT UPDATE THE FIRMWARE (It tends to brick it).