If i get it right, you want a manu to appear in the channel, depending on which server you are connected to. I don't know if you get me, but give this a try:
voice chan : $iif(hispana isin $server, msg chan voice # $me, msg chanserv voice # $me)
This should work fine, but if you also connect to other servers, try to make more $iif's.
Read mIRC's helpfile for more info