After ready the responses I first went to check the PC Audio output level. 
I slowly adjusted the Master Volume Output setting lower and lower and then suddenly the second audio signal disappeared at a level of 69. 
Now it is a clean single signal on FT4 and FT8.
Thanks for the many responses, I always get great advise and expertise from the hams on this group.
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73's
Glen, WB4KTF, Austin, TX