Click the title bar of the DemoMIDI editing window to make sure it is activated, or activate the segment by double-clicking the internal name in the project tree.
In the Transport Controls toolbar, click the Play from Start button, shown in the following figure, to play the entire segment.
Note that as the segment plays, the numbered buttons in the Output Status Toolbar display shades of yellow to indicate which parts, or PChannels, are starting and sustaining notes.
Click the Stop Immediate button, shown in the following figure, at any time to halt playback, or let the segment play to its end. Playback stops automatically at the end of the segment.