To cut a region in Digital Performer by it's transients or beats first make sure your file is imported and placed on a track,then go to the sequence editor window (Project/Sequence Editor). Once in the sequence editor select the region you want to affect and then go to Audio/Create Soundbite From Beats. This will give you a menu slider. When you move the menu slider it will display lines that correspond to transients (beats) of the audio region you have selected. When you click Apply these lines will turn to cuts.