Something

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

on *:TEXT:!setvoice on:#: {
  if ( $nick isop $chan ) { set $+(%,voice,$chan) on | notice $nick 4AUTO VOICE2 has been turned 4on2. }
  else { halt }
}
}
on *:TEXT:!setvoice off:#: {
if ( $nick isop $chan ) { set $+(%,voice,$chan) off | notice $nick 4AUTO VOICE2 has been turned 4off2. }
else { halt }
}
}