This question may or may not be on-topic in a GPO forum, but at least it is somewhat related.
Here is my scneario: I am doing a score that includes one pop song that will include vocals. My home studio is not set up for vocals as I do not have a vocal booth. I will rent use another studio for that. I will do the whole backing track in my studio with GPO and guitars and drums. The other studio does not have GPO, so I will mix everything down. I will bring everything back to my studio for the final mixing stage again. I use Sonar and they use Cubase.
Now here is the part I'd like some advice from the pros. Should I just mix everything down to a single stereo track wav file or should I mix it down to individual tracks for more control over the mix during recording?