isteveus: Thanks, I will try it without phantom power, I will look at the mixer in preferences-could it be the vloume was not turned up, I htought the volume was controlled by the board? The buttons are depressed selecting the USB output for the guitar channel and the board send. I'm pretty sure its correct. I followed the line diagram as well, there doesn't seem to be anything unselected, its a very straight forward board. anything is possible. I'll let you know.
The guitar input is via a Hi Z FET preamp and is not effected by the phantom power which only goes to the XLR.
On the mixer, make sure the guitar input is routed to the record bus and that this, in turn, is routed to the USB output.
Its most likely that the problem is with the input level setting in the computer. Try setting this at max to begin with.