OK, it turns out that the quarter-inch inputs on the back and the XLR inputs on the front can't both be used at the same time -- the four inputs are: two analog (quarter inch/XLR), one digital, one MIDI. So the box is still quite useful, especially for home solo recordings, but it isn't going to be the singing, dancing, bread-slicing solution to all my problems that I was hoping it would be.
(While I thought it had four analog ins I was thinking of all kinds of crazy stuff I could do: "I'll record the line-out on my guitar and mike it and sing, and I can play the tambourine! With my foot! And I can mike that!" )
Still and all, recorded some stuff with Chris earlier this evening. I'll try to get it edited and in shape tonight or tomorrow and hopefully will be able to upload some of it.