You've got it!
something like:

ALIAS.WORLD =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = MACHINE)(PORT = 1521))
(ADDRESS = (PROTOCOL = TCP)(HOST = MACHINE)(PORT = 1526))
)
(CONNECT_DATA =
(SID = SID)
(SERVER = DEDICATED)
)
)

Cheers