How do I stop the broadcast and audio from automatically playing when I connect? (ICCforMac/Windows)

If there is a live broadcast and the “broadcast” account is online, ICC for Mac/Windows will automatically tune to the Broadcast tab.  The audio will begin and the board will show the current position. 
If you prefer not to automatically tune in,  click on the Settings Icon  from the top toolbar > A window opens with a list options on the left. Click on 'General' and you will find the options for 'Internet and messages'.  Uncheck 'Automatically listen to broadcast'. 

Or menu above: Edit > Settings > General