I use 2 of these for various applications, like before the input of a looper in my setup. Very versatile, there are always ways to connect something. (XLR, Jack, RCA), and therefore a great device to add some extra connectivity to your setup.
Connecting both Jack and XLR to channel 1/2 works as well (but maybe not a good idea?), giving even more options.
Very handy utility mixer. Nice and small, but not too small.