Is it possible to mix using Software without VS20 Interface?

My friend borrowed my VS20 Interface and then moved away haha. I am wondering if it is still possible to mix using the software(computer based) without the Interface? The reason I ask is that when I try to use my computer for playback it seems static and a bit slow. Im sure this has something to do with my sound card/latency/etc..So again, Im not wanting to record, just to be able to mix what I have already done and then export it to MP3.

Thanks!

PS How do I print an effect on a track? :-)