I apologize for what is probabIy a very noobish question -- I did try to find an answer before posting.
I was a happy Soundbooth user but I'm open to jumping on the Audition bandwagon. Since (quoting Adobe) Audition replaces Soundbooth, I was a little surprised to learn that it can't open Soundbooth's native format. Is there any good (easy) way to get SB multitrack files into Audition?