To change current buffer "Performance" click "SELECT" button and your "Performance" banks will be displayed on the left side of the window

To select a performance for editing, click on corresponding number of the Performance you want to change to and display from the list.

In addition to selecting performances, the 'Performance Selection' list allows you to copy/paste performances from the banks and also apply various performance settings into your current performance. You can also apply different Parts to the current Performance.