Reverb; Adjusting Reverb Depth - Yamaha Clavinova CLP-555 Owner's Manual

Reverb

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To select a reverb type press the [REVERB] button a few times until
the indicator corresponding to the desired type lights (the indicators
light in sequence each time the [REVERB] button is pressed). No
reverb is produced when all indicators are off.
The depth of the selected reverb effect can be adjusted for the
current voice by using the [–/NO] and [+/YES] buttons while holding
the [REVERB] button. The depth range is from 0 through 20 (the
current depth setting appears on the LED display while the [REVERB]
button is held). A setting of "0" produces no effect, while a setting of
"20" produces maximum reverb depth. Press the [–/NO] and [+/YES]
buttons simultaneously while holding the [REVERB] button to recall
the default setting: "10".