It's a drum sound, and when the first scene is selected the arp plays the kick and snare when one key is pressed, adding hi hat and other elements when additional keys are played. In the second scene, the same cumulative process takes place, only each element is added discretely: kick alone, then snare, then hat etc. my question is, what exactly is different between the two scenes in question? Also. What is the option for making arpeggios that are additive in this way?