+ AA6YQ comments below
Thanks very much Dave. I went over the SignaLink installation & configuration process from the beginning again reading slowly, and spotted my mistake. I had the computer cable plugged into the side USB port of the tower PC which is not recommended. Reinstalled per the instructions and PTT and settings are all align now! I'll test it on FT8 after tomorrow.
+ Great! I'll keep an eye out for your callsign in WSJT-X...
73,
Dave, AA6YQ