Well, selected 2 pilots who also happened to be controllers for co-pilot voices. Copied their "lineup.wav" files and replaced their 'taxipos.wav' files with this new 'lineup.wav' file. Just checked off the 2 pilots as controller.
Probably an easier workaround, but hey, it worked. Thanks everyone for all the help and input!
Guess I could do as I did for the Controllers' "line up and wait" command and replace the pilots' voice sets for "taxi into position and hold" with "roger".
Thanks for the info, Ray. But have changed all 21 controllers using your method, and when tower tells you to "line up and wait", co-pilot confirms with "taxi into position and hold." How do you rectify that situation? Have Meatwater voice sets installed.