Modifying The Brightness; Filter Section - Roland JP-8080 Owner's Manual

Functions using OSC 1 and OSC 2
Functions which use OSC 1 and OSC 2 (Sync, Ring
Modulator, Cross Modulation) are applied as shown in the
following diagram to modify the sound.
LFO 1 & ENV
DESTINATION
PITCH
OSC 1+2
ENVELOPE
DEPTH
OSC 2
LFO 1
DEPTH
X-MOD
X-MOD
DEPTH

Modifying the Brightness

Sound consists of partials (overtones) at many frequencies.
The filter allows a specific range of frequencies to pass (or
restricts the way that they pass), thereby modifying the
brightness of the sound. The FILTER section and the FIL-
TER ENVELOPE section allow you to select the Type of this
filter, and to make the output waveform change in various
ways to modify the brightness.

FILTER Section

[TYPE] (Filter Type)
Select one of the following three filter types.
HPF (High Pass Filter):
This type of filter allows partials higher than the cutoff fre-
quency to pass. This is useful when you want the sound to
be bright and sharp.
BPF (Band Pass Filter):
This type of filter allows partials in the region of the cutoff
frequency to pass. This will emphasize the mid-range, and
is suitable for creating sounds with a unique character.
OSC 1
OSC
SYNC
BALANCE
RING
OSC 2
LPF (Low Pass Filter):
This type of filter allows partials lower than the cutoff fre-
quency to pass. This is the most common type of filter, and
is useful when you want to make the sound more mellow.
level
level
level
[-12dB/-24dB] (Cutoff Slope)
This selects the slope of the filter.
When the indicator is dark the slope will be more gradual (-
12 dB/oct). When [-12dB/-24dB] is pressed to make the
indicator light, the filter will have a steep slope (-24 dB/oct),
making a clearer distinction between the overtones which
pass through and those which do not.
level
–24dB/oct
[CUTOFF FREQ] (Cutoff Frequency)
This sets the cutoff frequency of the filter. Cutoff frequency
is the parameter which specifies the frequency at which the
filter will begin restricting (cutting off) the partials. By mod-
ifying the cutoff frequency you can control the brightness of
the sound. As the slider is raised, the cutoff frequency will
become higher, producing a brighter tone.
frequency
Cutoff Frequency
frequency
Cutoff Frequency
frequency
Cutoff Frequency
–12dB/oct
frequency
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