M Audio has terrible, probably the worst, customer service ever. I know because I currently own two units.
They work great when they work. If theybdon't work, and you can't figure it out, then God help you. I spent one hour 30 minutes on hold with customer service, to learn that he didn't know about the issue.
My experience is that any tweek of the unit or your computer will cause the drivers to corrupt. So I figured this out on my own, and the typical drill when that happens is to turn the unit off, unistall the drivers, reinstall the drivers (dl and install), then power up the unit again and pray. This seems to work 90% of the time.
I miss my Layla unit........