Wow I was off the grid for a week and just saw the news!!!  Old cakewalk user very optimistic over new possibilities.  I signed up at bandlab and find it most intriguing.  I instantly found a track I would like to add too.  How do I get it into Sonar, not to be negative toward Bandlab.  I've got some learning to do to get into Bandlab projects.  Looking forward to this new collaboration system.
 
Thanks,
Ken

Ok, I got it.  The author gave me an invite,  I accepted, and went to the mix editor.  I could download or record at that point.  It was easy.  Now my next question.  Can Bandlab do stereo tracks?

I think the author recorded a mono track and I'm on a laptop right now (mic only input).  It looks like its possible to do stereo.
 

I'm going to try bandlab and try its mastering suite