What is the one-click loop mode?
There are three loop modes. The one-click loop mode is the most convenient one. You can begin or end a loop of selected part of sound or video simply with one click of mouse with the one-click loop mode.

How to start playback at a specified position?
While you open a media file,there will be a wave graph in the wave-graph box,which is at the top of the main window. By clicking the left mouse button at any point in the wave graph box, you can start playback at the position where you click the left button.

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How to start the looping playback of the selected part of a sound or video with the one-click loop mode?
While a sound or video playback is running, there will be a running line in the wave graph box.
Click the right mouse button on the wave graph box at the point before the running line , the looping playback will be started from the position where click the right mouse button. At the time when you click the mouse button, the point where the running line reaches will be the loop's ending position.

How to end a loop with the one-click loop mode?
Simply click the left mouse button in the wave graph box , and the current loop will be ended.  The current playback position will be changed to the point where you click the left button.