Yep, it can be done, but there are a few quirks you need to know about. Let me see if I can describe how I do it without this turning into a novel-length post
The first thing you have to do is turn SEQ PG CHASE off. To do this:
1. Press the GLOBAL button in the PROGRAMMING section on the left hand side of the panel. The button lights up and the display changes to a menu.
2. Press the down arrow cursor button under the display until it highlights an entry that says SEQ PG CHASE (it's on the 2nd page of menu items, item # 2.3)
3. Turn the FINE TUNE knob to the left (counter clockwise) until the menu item says OFF.
4. Press the PRESET button to exit the global menu.
Now select a preset and create a sequence.
1. Select a preset. I chose "BRIGHT PWM MOTION" in bank 1, preset 05.
2. Turn the PATTERN switch (in the Arpeggiator section) to REC.
3. Play in a 16 note sequence.
4. Turn the PATTERN switch to SEQ.
5. Turn on the sequencer by pressing the ON button in the lower left hand corner of the Arpeggiator section.
6. Press a key and hear your 16 step sequence play.
7. Press the LATCH button (lower right hand corner of the Arpeggiator section) to keep the sequence playing.
8. Now turn on STEP EDIT mode by pressing the BANK button and, while holding it down, also press the LATCH button. The 16 buttons across the bottom should all light up with the button corresponding to the current step brighter than the rest. Notice also in the lower right corner of the display, it says P1, for page 1 of the 4 sequencer pages.
9. Now, to go to the next page (steps 17 - 32) while the sequence is playing, press the BANK button and, while holding it down, press the right KB OCTAVE button. The 16 step buttons all go dark. The display says P2 in the lower right corner. The BANK button is pulsing slowly while your 16 step sequence continues to play.
10. Now let's add one more note (#17) to our sequence. Press and hold the BANK button, and while holding it down, press the PRESET 1 button. The PRESET 1 button will begin pulsing. Your 16 step sequence is still playing.
11. At any time, hit the key you want for the 17th note. The next time through, your sequence should play 17 notes.
12. To add an 18th note, just press PRESET 2. You don't have to hold the BANK button. (This is the quirk I mentioned. I don't know why the BANK button is required on the first note on a new page.) PRESET 2 should be pulsing slowly. Again, hit the key you want for note 18 at any time and the next time around, it should be played as part of your sequence.
13. Repeat step 12 as needed to add as many notes as you want.
14. Once you have page 2 filled up, just repeat steps 9 - 13 to do the same for page 3 and 4. Remember you have to hold the BANK button and press the PRESET 1 button to enter the first note on a new page.
Hope you made it through all 14 steps!. It sounds much more involved than it is. Once you've done it once or twice it's pretty simple.
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Moose