Line6 GX...

So my EARWIG has packed in and i need a new headphone amp fast. but i also thought about getting a recordingg interface at the same time. i've seen the line6 GX at a fairly good price and wanted to ask, is it possible to use it like a headphone amp i.e playing bass with a backing track from the computer playing through the headphones at the same time, withough having it in a recording type set up, just as a practice tool??

Any input apreciated