I must be missing something. I cannot find any way to disable the front speaker and enable the headphones when using SSDR. It can be done through the front panel, just not through SSDR. That can't be right.
Can anyone confirm or point me in the right direction?
To disable the front radio speaker go to the upper left settings pull down, select the Radio Setup and the RX tab. The last button at the bottom of the window enables and disables the front panel speaker. It was running for a few days before I stumbled across it.