!!!CAREFULL Spanish Users!!!, you should change the name (title) of the IAC Driver, from Driver IAC (Spanish OSX) to IAC Driver (exact letters cause case sensitive).
If you don't change the name, the spark au plugin wont be able to find the port, and you will find this message in the preference of Spark plugin
"WOULD USE "IAC Driver Spark1 Midi OUT" BUT THE PORT DOESN'T EXIST"
Went mad and lost more than 2 hours looking for the error. Don't know if this detail appears in the manuals, I've read 1.7 revision, and didn't found it.