Yep you can! I took a CD with me that had the SS backing track, scales wise I played a few arpeggios and a few simple pentatonics. Play what every you really know like the back off your hand, not what's just beyond you if you know what I mean? I was gonna do a DT song for my audition but I thought meh I don't know it inside and out and I haven't gigged it, I'll just play something easy. They're just looking at your timing etc so they can effectively build the course around you.