Steinberg's Cubase recording application contains all the features needed to record, mix and produce high-quality audio tracks, and save them on your computer. The locators are a pair of left and right brackets that mark the beginning and end of a particular section. They can be moved to any point in a track and used for a number of purposes. There is a loop mode that will cause the section between the locators to repeat indefinitely. It's also necessary to bracket the entire song with the locators before exporting the finished product to an audio file.
Launch Cubase by double-clicking on the red and white "C" icon. Create a new project by clicking "New" from the top of the "File" menu. Click the "+" button at the top of the arrange window to create a new audio track. In practice, the locators are part of the arrange window and can be used with any kind of track.
Click on the transport bar. It will be at the base of the screen if using the default view. Otherwise, it may be necessary to click the "Window" menu and select "Transport" so make it reappear. On the left side of the transport bar, there is a small sub-window showing two track positions in bars beats, labelled "L" and "R." This shows the current position of the locators. By default, they will both be set to "1.1.1."
Click the number next to the locator labelled "R" and drag upward with the mouse. As the number increases, the right locator will move across the timeline in the arrange window. Once it has moved away from the start of the track, it's possible to click and drag the locator directly in the arrange window.
Position the left and right locators either side of a location that you wish to preview, and click the circular arrow button to engage loop mode and the selected area will repeat. In order to export the track to an audio file, set the left locator to the very start of the song, and the right one to the very end. Open the "File" drop-down menu and select "Export to File."