Roland VK-8M Owner's Manual page 26

Playing the Organ
[SOFT] (Soft Percussion) button
Switches the volume of the percussion.
Button
Lit (ON)
Dark (OFF)
When you turn the [SOFT] button off to strengthen the percussion sound, the
organ sound specified by the harmonic bars will become lower. This reproduces
the behavior of tone wheel organs. If the organ volume decreases when you turn
the [SOFT] button off, you can make settings (p. 44). You can also specify the
percussion volumes that will be selected by the Percussion Normal/Soft settings
(p. 43).
fig.01-23
Normal Percussion
Volume
Volume of the harmonic
bars will decreases
26
Explanation
The percussion sound will be softer.
The percussion sound will be normal.
Volume
Percussion
Time
Soft Percussion
Percussion sound
will decay
Volume of the
harmonic bars
Time