Using The Cosm Rotary Speaker Effect (Rotary Sound) - Roland VK-88 Owner's Manual

Playing the Organ
Using the COSM Rotary Speaker Effect
(Rotary Sound)
Rotary Sound is an effect which adds the modulation that is produced when organ
voices are used with a rotary speaker. On most rotary speakers, the high-frequency
speaker and low-frequency speaker rotate at different speeds. The VK-88 can
simulate this type of complex modulation.
fig.01-27
ROTARY SOUND [ON] button
The rotary speaker effect can be switched off.
Button
Lit (ON)
Dark (OFF)
SPEED Indicator
The left and right indicators light up alternately, indicating the speed of the rotary
speaker.
When you press the [BRAKE] button to stop the rotation of the rotary sound, the
indicator stops flashing, and then either or both indicators remain lit.
[SLOW/FAST] button
Switches the speed of the rotary speaker. FAST and SLOW will alternate each time
you press the [SLOW/FAST] button.
When the SPEED indicator is flashing rapidly, it indicates that the rotary effect is in
FAST mode; in SLOW mode, this flashes slowly. The change in rotation speed when
switching between FAST and SLOW occurs gradually.
[BRAKE] button
This button temporarily halts the rotation of the rotary sound.
Indicator
Either the left, the right, or
both SPEED indicators light
up.
The left and right SPEED
indicators blink alternately
40
Explanation
The rotary speaker will be applied.
The rotary speaker effect will not be applied.
The speed of rotation will gradually slow
down and then stop.
From a stopped condition, the rotation will
gradually become faster.
Explanation
The VK-88 uses an effect
algorithm based on COSM
technology, and is able to
faithfully reproduce the
modulation of an actual rotary
speaker and the irregularities
of its rotation. You can also
make sophisticated settings,
such as the characteristics of
the amplifier (p. 41), the
resonance of the speaker
cabinet, and the distance of the
microphone which picks up
the sound of the rotary speaker
(p. 66).
You can use a foot switch, D
Beam controller, or other
controllers to switch the rotary
speaker between fast and slow.
For details, refer to p. 42, 58,
68, 69, 70).
When a rotary speaker is
connected to the ROTARY
TONE CABINET jack on the
rear panel, the [SLOW/FAST]
button, [BRAKE] button, and
ROTARY SOUND [ON] button
function as follows.
[SLOW/FAST] Button
Changes the speed of the
connected rotary speaker. The
VK-88's rotary effect is not
applied.
[BRAKE] Button
Temporarily stops the rotation
of the connected rotary
speaker.
ROTARY SOUND [ON]
Button
Disabled when a rotary
speaker is connected.