Make the same post at  www.hifi-remote.com/forums/viewforum.php.  There are lots of knowledgeable contributors there.  If you include the list of components you have (brand and model number), someone may prepare a WAV file for you.  Learning how to do it yourself isn't too hard either.

Depending on the set of component you have, some non-upgradeable universals would also work, but most don't support discrete functions.