ludgerarnold: For major mods like the UP and clan quest, you can have them installed at the same time, but both use their own subdirectory and you can't combine them. Clan quest is built on an older version of the patch, as are all the other major mods like Final Nights, Camarilla Edition and to a lesser extent Antitribu.

The Audio Overhaul shouldn't be a problem, but since it probably still installs into /vampire, you have to check the archive before copying, and manually see to it that the files go into your /Unofficial_Patch directory instead of /vampire; or into /cqm for clan quest etc.

I have no idea what this xrmod is. If it's just a music or model replacer it should work fine with the patch and most mods, if it's something that chamges maps, dialogs or game mechanics then probably not, unless the author has specified the version of the patch it is supposed to work with.