So I'm thinking of getting the UX2 over the UX1 - The only difference I can see is that the UX2 has 2 guitar/bass inputs. Now I can see a use of having 2 guitar inputs for recording 2 guitars at the same time, but is this possible? I read somewhere that you can only use one at a time... Say I wanna do guitar and bass at the same time? Is this possible?