Yamaha Electone EL-57 Owner's Manual page 13

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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