Hello.
At the end of the default program name i.e. “First Contact” there’s a little “down arrow”. Click on that and you’ll get a new small “media bay” window. One of the library names is “HALion Sonic SE Trip”… (Make sure it says “Library name” in the first column in the Filter window. If you can’t see the Filter window then set it up by clicking the small icon in the lower left corner and tick in “Filter”.) Hope you’ll find it!
