Question about 5.1 Audio Export

Hey Folks,

I just completed a grueling, 2 week long 5.1 mix for a sci-fi film, and I've run into a strange problem. I think the root of the problem is that I don't understand Sonar's signal flow- here goes.

The music for this film is sent out of a stereo bus, with a send (at -4.5 dB) to rear left and rear right. During our mix this has sounded fantastic, so I never gave it a second thought, UNTIL... in the process of mixing the film down, I just realized that the rear channel music never made it into the final export! Why not? The settings I use to mix everything down are:

Source Category = Entire Mix
Channel Format = Split Mono
Mix Enables = Everything (Fast Bounce)

Please help me figure this out- why is the music (via a send on the music bus) not being delivered out those rear channels? Please let me know if there are any additional details that I need to provide!

-Alex

Right, I'm not sure that answers my question, but I could be wrong! I've been mixing in surround now for months. Issue is, the music bus has a send on it that routes to my rear left and rear right speakers (5-6)... While mixing this sounds as expected, but when it comes time to export the project, that music send to the rear disappears. Nada, nothing, zilcho.

I think I explained the issue a bit better in my first post.

\I don't want any music to get in that center channel, so I figured it would be simple just to send the music out 1/2, with a send on that bus to 5/6. Instead of dealing with a Surround Panner, just seemed simpler that way I guess. I want the music coming out channel 1/2 at 0 dB, and then out 5/6 at -4.5 dB.