You can send a patch change as per the manual on page 49 for the Express XT and page 47 for the Micro Express. Our documentation has misprinted the actual sysex string. The following string should be entered in the track:

F0 00 00 33 07 22 00 xx F7

The manual printed: F0 00 00 33 08 22 00 xx F7 (the 08 byte is not correct).