Roland AT900 Music Atelier Owner's Manual page 59

Adding Sparkle to the Sound (Percussion)
This adds an attack sound to the beginning of the note, making the sound
crisper.
3.
Press the Percussion [4'] button or [2 2/3'] button (indicator
lit).
Play the Upper keyboard and notice that an attack has been added.
Button
Percussion [4'] button
Percussion [2 2/3'] button
Adjusting the Rate at which the Percussion Decays
You can shorten the decay time of the percussion sound.
4.
Press the Percussion [Fast Decay] button to switch the
indicator between lit/unlit.
[Fast Decay] Button
Lit
Unlit
Explanation
Percussion one octave above
Percussion one octave and a fifth above
Explanation
The percussion sound will disappear quickly.
The percussion will have a sharper attack.
The percussion sound will disappear slowly.
The percussion will have a more gentle attack.
Selecting and Playing Sounds
NOTE
Percussion [4'] and [2 2/3']
buttons cannot be used
simultaneously.
NOTE
The Percussion [4'] button and
Percussion [2 2/3'] button are
valid only for vintage organ
voices of the upper part.
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