Oh... wait, you said you had Editor already. Were you using Melodyne Editor for your tests or the version that came with Sonar? I think if you have Editor it automatically integrates into Sonar... or something so that might have allowed the whole clip to transpose.
 

Really why?
Studio One have Melodyne to but S1 can do it without Melodyne. Reaper can do it more perfect and... certainly Cubase... attention!!! Cubase 5 can do this better.
Sonar X3 should say thanks to Melodyne? :) Because without it everything remains in the same place.


Sonar X3 good DAW but not the best. I hope Sonar X4 will be better.

I don't know Studio One too well, nor do I particularly care for its interface, but I have to say this is one area where it seemed a lot more obvious *to me* where to alter the overall pitch of a clip natively (that is, without resorting to any plug-in or Melodyne or V-Vocals, etc.).  
 
On the rare occasion that I want to change the pitch in Sonar, I find myself doing a double-take of the options in the inspector to find what I'm looking for.  Not a huge deal, but it's one of those functions that could stand out a bit more in my opinion.  
 
Btw, I only usually change the pitch of something if I'm experimenting during composition or if I'm trying to work out a part for another band where the pitch way off from A=440.  Being able to quickly change and audition the pitch change is key (no pun intended)....

Sonar's offline transpose algorithm, courtesy of iZotope, has excellent fidelity compared to other solutions. But it's not real time, nor does it do pitch change other than a semitone. I'd like to be able to change pitch by, for example, 10 or 20 cents.
 
The quality of the Groove Clip transposition feature depends on the amount of transposition, and it has to work in real time...so that's always a challenge.
 
Studio One Pro's real time transposition is very good when compared to other real-time pitch transposers, but ultimately offline transposition beats real-time transposition for fidelity, and real-time transposition beats offline transposition for convenience.

I agree Craig, and it makes sense the way you describe.  As with all choices, it would be nice to have both ;-)
 
(I was going to resist saying "have my Cakewalk and eat it too", but I failed)

It's not often I've needed to change the pitch of an entire project for the same reason as the OP, but when I have, I must admit that I've had to stop and think long and hard about the best way to achieve my goal in Sonar.  An easier way to do this would be great, but this is definitely in my "nice to have" list versus my "must have" list.

Silicon Audio
It's not often I've needed to change the pitch of an entire project for the same reason as the OP, but when I have, I must admit that I've had to stop and think long and hard about the best way to achieve my goal in Sonar.  An easier way to do this would be great, but this is definitely in my "nice to have" list versus my "must have" list.

If I need to change the pitch of an entire project, I load the final stereo mix into Sound Forge and use its offline stretching algorithm, which is excellent - especially if you don't compensate for duration.

As the OP, just to clarify and give Sonar credit where it's due.  Once I'd found the best way to do this I got perfect results.
 
Turning the track clips into groove clips produces problems.  Using Process/Transpose is the way, ticking the Audio Clip box and selecting the appropriate offline algorithm, e.g. the 'bass' one for the bass track.  I shifted nine varied tracks up by four semitones and the results were excellent.  So my problem was not using the correct Sonar tool for the particular job. 

idk if you have sound forge 10, but the elastique time/pitch shifter in it is freakin awesome