Something

alias nvoice {
  echo 4 * Noticing all voices on #
  set %i 1
  :next
  set %nick $nick(#,%i)
  if %nick == $null goto done
  if %nick isvoice # .notice %nick $1-
  inc %i
  goto next
  :done
  echo 4 * Finished noticing all voices.
}