Try this
Code:
on *:text:*:#:{
  if $highlight($1-) {
    if $chan != $active || $cid != $activecid { echo -bflirt Highlight: $nick in $chan said: $1- }
    if !$appactive {
      .gload -h voice rover.acs
      .gtalk voice Highlight: $nick in $chan said: $1-
    }
  }
}
on *:agent:if $agentname == voice { .gunload voice }