How do I add Virtual instruments

[jbx]

I just got Auria Pro for the ipad and I am having a bit of a problem with the virtual instruments. I just can't find them on Auria. Am I supposed to buy them separately or something? Where are they located?

I was able to add a midi track and choose the instrument for the midi. But not for any other tracks. There just aren't any instruments in the drop down box :/ That's why I was thinking maybe I need to buy them separately....??

Any help is much appreciated.