Sequence markers can be added with either the Timeline or Canvas window active. When they are added in the Timeline, they appear in green along the ruler, as shown in Figure 9.9. These can be used for anything you want to reference, such as marking music or audio cues, using them as bookmarks for later reference, adding them to force an I frame for an MPEG export to DVD Studio Pro, keeping a note for further editing or adding a title later, exporting to Soundtrack, and so forth.