Gotcha. So, on your citrix server - goto start, all programs, citrix and find a console with a name like "Advanced Management Console" or "Presentation Server Console" or maybe even "Citrix Management Console" It is different then the Access Management Console. When you launch open it, it will ask for credentials, that is how you will know you have the rigth console. Then, find the policy section and right click and create a new policy. FInd the policy for enabling microphones. After you create the policy, you need to right cilck it and apply it to all explicit users.
