The !op command will only work for those with access to your room. If you have not added anyone to the aop list then nobody but you can gain ops with the !op command.
Voice is a user mode. Users with voice +v, signified with a + character next to their nicknames may send text to the room so that others may see what they have typed. This is not an audio feature.
Hope this helps.
Nothing rhymes with Cindy Crawford after 9 coronas...