First, addressing the backsound issue--I don't know that backsounds continue until the next backsound is encountered--when the sound is entered an an experiment item. I think it needs to accompany an item within a questionnaire (.que) file. Can you try that and if that works, let's then address the DirectRT issue. What release of DirectRT v2008 do you have installed on Windows 7? You might try first uninstalling and reinstalling the latest version from www.empirisoft.com/download.aspx (especially if you have a beta version.