The voice input feature is available in GuideConnect from version 1.07 and uses Windows' Speech Recognition.  Unfortunately Windows' Speech Recognition is only available in a limited number of languages, meaning GuideConnect's voice input is only available for some languages:

Country Is Voice Input included in GuideConnect?
UK English Included from v1.07
US English

Included from v1.07

Australian English

Included from v1.07

Dutch Not available
Belgian Dutch Not available
Italian

Included from v1.08

Danish Coming soon
Czech Not available
Norwegian Not avaiable
Swedish Not available