Yamaha Electone STAGEA ELS-01C Owner's Manual page 24

For example, if you have pressed the [PIANO] button, the following display
(Voice Menu) will appear.
2
2
Select the desired Voice name from the Voice menu.
The Voice menu contains many Piano Voices, more than can fit on one display
page. To change the display pages, press the appropriate number buttons in the
display.
The color of the selected Voice name changes to orange, indicating that it has
been selected.
24 ELS-01/01C/01X Owner's Manual