Zoom 708ii -can I use the aux input to play my bass along to mp3

Hi

I have managed to score a Zoom 708ii and am currently awaiting delivery of the item.
Doing some googling I found a manual for the 708ii that mentions using the type keys to select Bass or Aux but no mention of using both at the same time.
I would like to be able to play along with mp3's when I practice and was wondering if I can use the aux input to play my bass along to mp3's or is the Zoom 708ii only capable of handling either Aux in or Input jack at one time , anyone able to answer this? Thanks