The Second is the mouse tool.Click your right mouse key to modify the begin or the end of your selection even if screen scrolls.
The Third is the keyboard tool.Click "Home" key will help you to locate first the left of the screen then the head of the whole song. Click "End" key will help you to locate first at the most right of the screen then the tail of whole song. Click "Ctrl+Home" key will help you change your beginning first to the most left of the screen then the head of the song.Click "Ctrl+End" key will help you change your end of selection first to the most right of the screen then the tail of the song.Click "Ctrl+A" will select all the content.
The fourth is the "locate accurately" and "select range accurately" which help you to select a specifically described segment.
The Last is the Manage range menu.All Editor provides these tools to help you accurately manage the selection forward or backward etc..