Using The Cosm Rotary Speaker Effect (Rotary Sound) - Roland VK-8M Owner's Manual

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-8M can
simulate this type of complex modulation.
fig.01-27
[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 or right SPEED
indicator is lit
The left and right SPEED
indicators are alternately lit
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 speaker, one
of the indicators remains lit.
Explanation
The speed of rotation will gradually slow
down and then stop.
From a stopped condition, the rotation will
gradually become faster.
Playing the Organ
The VK-8M 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. 30), the
resonance of the speaker
cabinet, and the distance of the
microphone which picks up
the sound of the rotary speaker
(p. 42).
You can use a D Beam
controller to switch the rotary
speaker between fast and slow.
For details, refer to "Using the
D BEAM Controller to Produce
Common Organ Effects" (p.
31).
You can have the lighting of
the SPEED indicator be
synchronized to the rotation
speed of the woofer or the
tweeter (p. 42).
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