5.1 & 7.1 mixdown and stereo monitoring

How does FMOD mixdown from any surround format (including 7.1.4) to stereo if the platform is not using a surround format? I read in the forums that you did away with SRS. What is the new method? And is there any officially sanctioned way to monitor how the mixdown will sound from within FMOD Studio? If I simply change the output bus back and forth from surround to stereo, my worry is losing surround panning and routing, or other potential unforeseen side effects. Would doing this be an accurate reflection of runtime mixdown? It would be great to have a simpler at-your-fingertips way of monitoring FMOD’s mixdown behavior on the fly.