Yamaha Electone EL-900 Owner's Manual page 13

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Select one of the registrations shown on the LCD by pressing the
appropriate Data Control button.
Up to 16 registration selections are shown on the LCD, and the 16
Data Control buttons correspond to those selections.
The Data Control buttons are used to select voices, rhythms and
various functions. They are also used to raise or lower volumes
and levels, as well as move the cursor up and down, right and
left.
NOTE:
Inadvertently pressing another button on
the panel may change the content of the
LCD during the Registration Menu
operation. In this case press PLAY button
on the Music Disk Recorder section, to
retrieve the Registration Menu display.
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