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 !

   Can't you use the 12/8 as if it's in 4/4 with triplets? I don't understand.    I would think it's at least possible.

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.

I've composed a track a few months ago with 6/8 at 112BPM with a change nearly at the end of the song at 4/4 and 123BPM, but obviously in linear order, not both together at the same time or in harmony, i don't know if you need a linear arrangement or both time signatures played at the same time but, if you just want to do a linear adjusment like me then, is pretty easy and possible.

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.

It's been a couple of years or so now, but a while back I had inquired about having one midi track in 7/8 and another in 6/8, and was told by a Cakewalk staff member that it was not supported in Sonar.
 
Bob Bone
 

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

I have only done ANALOG multi signature stuff, so if the newest update doesn't support this, I'd record the rhythm track to a click track in whichever time signature is the primary one, then record the other time signature instruments over it as audio instead of MIDI.

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.
 

In case you want stay in MIDI domain, you just need "BPM converter".
F.e. 12/8=6/4  120 BPM is 4/4 80 BPM (120*4/6)
As was discussed in other thread, such conversion can be done using my tool: http://www.azslow.com/index.php/topic,286.0.html (using "Apply Tempo Map" preset)