Language as a meaningful voice refers to the words a voice only. Written language is just a representation of the spoken language. A meaningful voice in one language might be a sound with no meaning in another language.
Language is sound meaningful. Referring to the speech only. Language is a representation of spoken language. The sound has a meaning in one language may sound, there is no meaning in another language.
Language is the means. Mean words spoken only. Written language is the only representative of the spoken language. The voice is the meaning in one language may sound no meaning in other languages.