I wish I had hooked this thing up to my main system earlier, I've had it since October, so I bet I can't return it. I hope once all these issues are resolved we can trade them in for a unit that might actually meet the printed specs.
My phone call to customer support was a joke, he didn't even acknowledge there was a problem.
I haven't had problems with headphone output, but have had the mic issue, and low output problem, as shown below. For now, my low audio and microphone audio fix will be accomplished by using a Behringer 1002, or Mackie 1402VLZ3
The following test was conducted yesterday by putting a .775v signal source into an analog channel of the VMS4.