There are 237 patterns in memory, including 5 preset and 232 user-patterns. Many of the user-patterns have been pre-programmed, however you can edit any pattern in memory, and even copy a pre-programmed pattern to a new user location and edit it, or create your own patterns from scratch! You'll find that Programs and Combinations have Arpeggio patterns already assigned to them - some will trigger as soon as you select the sound and play the keyboard, while other patterns are there, waiting to be triggered - you simply turn on the ARPEGGIATOR ON/OFF key (lit), and the pattern assigned will trigger when you play. This is a great way to get an idea of how the Programs and Combinations work in a Song or performance application!