Do you mean voice users who have a User Level of 5,10,15,20 etc?
if you did then something like..
/auser 10 Andy
On @*:Join:#: {
if ($level($nick) == 5 || $level($nick) == 10 || $level($nick) == 15 || $level($nick) == 20) { mode $chan +v $nick }
}
If could you explain how you mean?
You can change $nick to $address($nick,N).
Hope this helps.
-Andy.