Marker preview (scrubbing) plays a very short section of audio whenever a selection marker is moved. Preview duration specifies the amount of time to play just after the start marker or just before the finish marker. Setting the time to 0 disables previewing. Use the drop-down list to select when marker preview is triggered. By default previewing is done only when the marker is moved with the arrow keys. Select the second item to enable previewing after mouse dragging as well.