First of all, I apologize for the fact that the version that can be dug out here someplace is ancient : make sure you're using the latest, 1.0 one, found for instance here
. Second of all, I haven't downloaded the very latest version of XEH, so I do not know if it actually -works- with it or not, but frankly I can't see any reason why it wouldn't. You could try with an older version of XEH too to see if that might be the problem - hopefully not.
With the latest version of RUG DSAI + XEH, both loaded like any other addon, I don't see any reason why it wouldn't work. Just make sure the addon folders are set up properly (have a folder inside them named "addons" etc). Also remember some units simply -will not work- with RUG DSAI, simply because they have their own eventhandlers defined outside of XEH (i.e., they're NOT XEH compatible): these sadly include the excellent Russian Federation units by RHS. Try it with BIS default units to make sure it works. Also remember only Russian and English really have extensive "non-combat" voices; for instance the default resistance voices (Arabic) only activate when in combat.
Hopefully you can get it to work!