New to Sonar Pro. I adore the new PRV Track Pane. THANK YOU Cakewalk!!!
 
Some observations:
1. Disappointed I still can't solo more than one Take Lane. Why is this? I do a lot of double-tracking of vocal lines and it's still really inconvenient that I can't audition two takes together without muting everything else, which it seems like I still have to do one take at a time.
2. Disappointed that the bug still persists from X3 where dragging two takes from one track to another causes those takes to not drop correctly into their own lanes in the target track
3. Here's another seeming bug: If I select clips for all takes in a track, I can alt-click to split those clips. However, if I select a subset of all the takes, sometimes I can't split them. Intermittent.
 

As far as #1 goes, you are right you can't hit the solo button for more than one take but if you leave them all un-soloed and un-muted then using the comp tool you can hold down 'cntrl' and click on multiple takes to un-mute them. Then you can have multiple takes playing back at the same time.

We'll consider #1 for a future update. 
#2 is being addressed for the 06 update.  If you could detail the specific condition that happens in, we
can ensure we validate that case.
Please try that early access build when it comes out and let us know. 
As for #3, if you can come up with a solid recipe that'll help.  In the interim will inspect the command
and try to repro. 
Note that you can't currently split clips with region effects on them but we're working to address that
in an update. 
 
Keith