Something

on $*:JOIN:#:{
  if ( %voice == off ) { halt }
  mode $chan +v $nick
}

on *:TEXT:!setvoice on:#: {
  if ( $nick isop $chan ) { set %voice on | notice $nick 4AUTO VOICE2 has been turned 4on2. }
  else { halt }
}
}

on *:TEXT:!setvoice off:#: {
if ( $nick isop $chan ) { set %voice off | notice $nick 4AUTO VOICE2 has been turned 4off2. }
else { halt }
}
}