1. In a device including existing software programs associated with an existing computer and keyboard, the improvement comprising an apparatus for enabling a user thereof to operate said device through the use of voice commands, keyboard inputs or both, comprising: (a) electrical circuit means for installation solely between the existing computer and keyboard; (b) a microphone connected to said electrical circuit means for inputting voice commands to said electrical circuit means; (c) said circuit means including voice recognition means for recognizing said voice commands; (d) said circuit means further including a keyboard switch for adjusting priority between voice commands and keyboard entries; (e) said circuit means further including a microprocessor for controlling receipt of voice commands and keyboard entries and for controlling transmission of said commands and entries to said existing computer as if they came from pressing keys of said keyboard, said microprocessor including a read only memory, a random access memory and an A/D converter said read only memory being preprogrammed to take over said existing computer upon activation thereof without programming said existing software of said existing computer prior to commencement of operation by voice command.