12/8 and 4/4 time signatures together in perfect harmony (or at least in MIDI). Possible ?

Is it possible to have mixed time signatures in Sonar ? I have an upper part ( SATB, entered as just one MIDI track ) in 12/8 time signature and a the piano part ( again, just one MIDI track ) that needs to be in 4/4 time. Is it possible to set this up in Sonar. In case you are wondering who would be stupid enough to devise such an arrangement ... blame Stephen Sondheim !

I'd record the 12/8 (or 4/4) in one project.
Render to audio.
Drop audio in new project of opposite time signature.
Record the rest.
 
But then again I'm a lazy lout.

Notationally, you should pick the time sig that makes the most sense. Probably the the 12/8, I would think, as it can "absorb" so to speak the 4/4. At least that's what I do, using tuplets as needed. I generally try to pick the time sig that will simplify and clarify things best. Same with key sig, by the way.

U less I'm missing something
12/8 is the same as 4/4 with an 8th triplet on every beat. You would just make sure the triplet 8th notes are the same tempo as the 8th notes in the 12/8 bar
It's really just how you count them in you head
The feel is basically the same

Thanks for the various replies.
I think I conclude that it is not possible to include 2 different time signatures per se ( as Bob Bone confirms ) and that a workaround is required.
I had actually already taken the approach suggested by bapu ( record the 12/8 in one project, render to audio, drop audio in new project of opposite time signature ).
The triplets idea would also work I think, but I scanned in my music so it was already in 4/4 and I would have had to convert the crotchets to triplets.
As I say, thanks for all the considered responses.
 

dannyjmusic
U less I'm missing something
12/8 is the same as 4/4 with an 8th triplet on every beat. You would just make sure the triplet 8th notes are the same tempo as the 8th notes in the 12/8 bar
It's really just how you count them in you head
The feel is basically the same

No, you are right. It's just that in 12/8, you don't need triplets. Three 1/8 notes in 12/8=One Triplet group in 4/4. As sonar tends to have problems with tuplets, I sometimes go with the 12/8 if I have extended periods with 1/8 note triplets. On the other hand, in 12/8 you will sometimes have to use duplets for double 1/8 note figures. Just depends on which way you would have more tuplets (tuplets being the generic term for duplets, tuplets, quadruplets, etc).

I'm just thinking out loud here, but what would happen if you set the time sig to 12/8 - record all those passages then change it to 4/4 for those bits? All in Midi I mean. Would it totally screw the timing up?
 
 

Sanderxpander
If you position lock the data I think it should work.

MIDI clips "lock" does not fix absolute time for events. Events are timed in ticks, so in M:B:T domain and so changing the tempo still influence locked MIDI.
 
The method I have mentioned before recalculates event positions in one tempo (signature) to another using absolute time. It calculates absolute time for every note in the original (for that clip) tempo/signature and map the result to the current tempo/signature. The first part is what happens during rendering MIDI into audio, but the second conversion is what allows to keep the result in MIDI format.