Metronome Volume - Yamaha Silent Piano SC2 Owner's Manual

You can also reset the value by pressing the [VOICE/VALUE] control while holding down the
[Metronome] button.
 Adjusting the metronome volume
While holding down the [Metronome] button, press one of the C4 – G5 keys to set the metronome volume.
The higher the key, the higher the volume level.
Default setting: 15 (D5)
Min.
C4: 1 D5: 15
G5: 20
Max.
Highest key (C7)
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SC2 Owner's Manual