Usually, simply switching from Mic & Speakers to Telephone (or vice versa) in the GoToWebinar panel will resolve all audio issues on your end.
If you are still having issues, please visit GoTo Webinar's Audio Fast Help site. You'll find many helpful answers to common issues such as:
- problems with your dial-in number
- volume issues (can't hear anything or sound quality is poor)
- audio through VoIP vs. land-line and more.