SOHAM gave me some clues in other place, here you have:

Are slices saved in a part, or a pattern

As soon as [BANK] is pressed a prompt saying “CHOOSE BANK” will appear. Banks with content are
indicated by green <TRIG> LEDs. A red <TRIG> LED indicates the currently active bank. As soon as a bank
is selected the prompt will change to “CHOOSE PATTERN”. Pressing a [TRIG] key now will select a pattern
located in the selected bank. Patterns with content are indicated by green <TRIG> LEDs. A red <TRIG>
LED indicates the currently active pattern. This method of pattern selection allows for quick changes of the
active bank and pattern. If you don’t wish to select a pattern, just release the button combination after the
“CHOOSE PATTERN” prompt appears.