There are a variety of surround sound formats. The most common is 5.1.
You must pay close attention to the surround configuration of your audio interface and make sure that you've wired your audio interface correctly for your speakers.
Creating additional Output channels is necessary to monitor the master levels of your surround mix.
You can use the Surround Pan control to position tracks into the desired speaker positions.
By changing the output assignment you can achieve a phantom center position (5.1 without a center channel).
To ensure proper playback on consumer surround systems, you need to filter the LFE output.
You can use the Master Audio Object to control the volume level of all outputs simultaneously.