A line member who can keep his mouth shut, wow excellent.
When corps say they need you to be on coms they kinda mean they need you to be on to listen.
Having no voice or lower speaking ability might hamper your fc ability or target callling but would not impede your line ability to any major extent. Any corp or alliance that would not tolerate a mute deeps player is likely going no where fast anyway & not worth joining.
The major issue you will have is recruiters thinking you are a spy & wishing to hide in annomity & silence.
We have a deaf member in our alliance. He goes on PvP ops as we provide a text interpreter for him. Those of us who can hear are required to at least be able to listen to voice chat.