Yamaha Electone STAGEA ELB-01 Playing Manual page 7

To begin with, select a Upper Keyboard Voice
Press the [STRINGS] button in the Upper Keyboard Voice 1/2 section.
Try playing some of the keys on the Upper Keyboard, and check out the Strings sound.
Take a look at the display on the panel
<STRINGS/VIOLIN>
¿01:Strings 1
You may not be able to notice it right away, but the [STRINGS] button actually has a
variety of "hidden" Strings and Violin sounds in it.
Since the Voice name "Strings 1" is shown at the bottom of the display, you know that
the "Strings 1" Voice sounds when you play the keys on the Upper Keyboard.
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Playing the ELB-01 — Tutorial 7