Filter
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The sound signal generated from the OSC is processed
through the filter, which can emphasize and reject
a selected frequency range. The filter can affect
and change the sound’s brightness, boldness, and more.
frequency
frequenices that are cut
LPF
level
frequenices that are cut
MIN MAX
frequency
level
If you turn the knob far too right, you will hear
an ear-piercing, high-pitched sound. This sound
is generated from the filter itself. If you
continue to play the keyboard in this manner,
you will realize that the filter-generated sound
is completely independent of the waveforms
and pitches generated by the OSC (oscillator).
Set the FILTER ENV sliders in this manner
and play the keyboard.
First, set the [CUTOFF] knob
to the “two o’clock” position.
P ress the [TYPE] button and select LPF
(*1)
. The LPF controls the amount of high frequencies that pass
through. Thus, it has no effect on sounds in the low frequencies.
T urn the [CUTOFF] knob as you play. Slowly turn it counter clockwise from all the way right (MAX)
leftward to (MIN). The sound will gradually muffle during this process, and when it is turned left all
the way, most of the sound becomes inaudible. This is due to the fact that most of the sound
frequencies have been filtered out and rejected.
N ext, turn the [RESONANCE] knob. Turn it all the way left (MIN), then gradually rightward
to (MAX). It will start to resonate, yielding a colorful, howling sound.
On a piano, its initial sound would
include most of the harmonics that
generates bright sound. Afterward,
the sound would fade gradually,
as a decrease in harmonics will result
in a dull (dark) sound. To re-create
this phenomenon, create a time-varied
effect with the filter. In other words,
the operation of turning the [CUTOFF]
knob becomes automated as you play
the keyboard.
L astly, turn the [KEY FOLLOW]
knob. Turn it right all the way
to the (
+
) position; the low
frequencies become softer,
and the high frequencies become
brighter inversely. Try setting
the knob at different positions,
and play the keyboard to hear
what it does.
Next, let’s go to the “AMP”, where the initiation and termination of the sound are determined.
(*1) Low Pass Filter
AD
S(=0)
DEPTH
time
R(=0)
cutoff frequency
When you are finished, turn the knob
all the way to the (
+
) position.
Press this button to select LPF
Turn this knob as you play
Two o’clock position
One o’clock position
Now, set the RESONANCE knob
to the “one o’clock” position.
D
A
DEPTH
(+)
Turn this knob as you play
Turn this
knob
as you play
The Function of Controls
2
4
Chapter
FILTER
1211
4
Chapter
The Function
of Controls