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Thanks for your patience. I believe the GoToMeeting version 10.14 (which includes desktop audio sharing) should now be available on all accounts, unless managed separately by an account admin.
Using Stereo Mix is the best way to let your Attendees hear the audio from your computer, but your microphone will not be able to be heard at the same time. The easiest solution is for you to call into the conference call by telephone, and let your computer broadcast the audio of your video.
The only other option requires additional audio cables to connect your speakers back into the mic input as well as your headset, as detailed here: https://support.goto.com/meeting/help/how-do-i-optimize-my-computer-for-video-sharing-g2m090150
We are currently working on a built-in solution for this. It will be announced here once it is available.