Anyone using the Line In of the Zoom G7 or G9 for recording non-guitar parts, such as vocals, using the USB Output. ?

If so, what do you have connected ? Mixer, pre-amp & mic ?
Did you get good results ?
... or Don't bother. It's just a hype feature that doesn't work ?

My home PC is being upgraded at the moment, so I might try this in for a few weeks, but I thought it would be nice to get some feedback.