Yamaha ARIUS YDP-S55 Owner's Manual - Page 16
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Also for Yamaha ARIUS YDP-S55: Quick Operation Manual (2 pages), Midi Reference (4 pages)
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Playing the Piano
Intelligent Acoustic Control (IAC)
IAC is a function which automatically adjusts and controls the sound quality
according to the overall volume of the instrument. IAC Control is effective only
on the sound output of the instrument speakers or headphones. Even when the
volume is low, this lets you hear both low sounds and high sounds clearly.
Especially when using the headphones, the burden on the ears is reduced
without raising the overall volume excessively.
To turn on/off IAC:
While holding down [DEMO/SONG] and [PIANO/VOICE] simultaneously,
press the C#2 key to turn the function on or the C2 key to turn the function off.
To adjust IAC Depth:
While holding down [DEMO/SONG] and [PIANO/VOICE] simultaneously,
press the D2 key to decrease the value, or the E2 key to increase.
The higher the value, the more clearly that low and high sounds are heard at
lower volume levels.
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YDP-165, YDP-145, YDP-S55, YDP-S35 Owner's Manual
Lowest key
Lowest key
C#2 (On)
C2 (Off)
D#2 (Default)
D2 (Depth -1) E2 (Depth +1)
Default setting:
On
Setting range:
-3 – +3
Default setting:
0