Ok, I've done some more research. I think the problem may be that the document language is not set to Spanish. This is a per-document setting and cannot be changed in Reader. See Can Adobe Reader read out loud in French/other languages?
Ok, I've done some more research. I think the problem may be that the document language is not set to Spanish. This is a per-document setting and cannot be changed in Reader. See Can Adobe Reader read out loud in French/other languages?