I have not been able to run any tests yet (and even with tests there's the possibility of user content causing issues), and some people may think that given it's called AudioQuake it is audio-only, so seems best to provide a warning.
Also provide a warning for setting the screen mode. None of the modes I have tried have the strange graphical artefacts I previously found with some custom modes, but again seems best to warn people, particularly about those custom modes too.