Yamaha ELS-01/01C Playing Manual page 40

The "User" setting of Vibrato allows you to create your original vibrato by changing the vibrato delay,
depth and speed. The Tune setting, set higher than other Voices, makes the Harmonica stand out. The
Delay effect lends an echo to the sound as if the instrument is being played in a hall.
This completes the LEAD VOICE 1 settings.
LEAD VOICE 2 is not going to be used in this Registration, so check that its volume is set to 0.
Now that the Registration Memory 3 settings are complete, record these settings to the [3] button in Registration
Memory section.
40 Playing the ELS-01/01C — Tutorial