Vocal subroutine
The vocal subroutine was a computer program integrated into Emergency Medical Holographic programs.

While in sickbay aboard the  in 2374, The Doctor asked the EMH Mark II to disengage his vocal subroutines for one second so he could explain why he was aboard the Prometheus. ()

In 2376, the Qomar Abarca suggested to his associate Tincoo to deactivate The Doctor's vocal subroutine and to re-program him but forgot this suggestion when he heard The Doctor sing. ()

de: Vokale Subroutine
Subroutines
Communications technology