Using the MX-200 Quick Key Access System with Global Series (520, 525, 527, 530, 535) Organs. (From Rodgers Tech Web Site).

Quick-Key Access to MX-200 voices requires a Program Change # and MSB # (also known as a Variation number). To send MSB and then a Program Change on Rodgers Global Series Organs:
- Hold SET and press the bottom of a MIDI coupler tab. The tab will flash. Release SET, but continue holding the MIDI coupler tab.
- To assign the MSB (Variation) number, press the key on the SWELL MANUAL corresponding to the MSB (Variation) number desired:
- MSB 65 = Swell Lowest E
- MSB 66 = Swell Lowest F
- MSB 67 = Swell Lowest F#
- MSB 68 = Swell Lowest G
- MSB 69 = Swell Lowest G#
- Release the MIDI coupler tab. The tab will continue to flash.
- Press the key from the Quick Key Access chart corresponding to the desired PC number. The MIDI coupler tab light remains on steady. The MX-200 voice is now playable. It now can be set to a piston for later recall.