Roland Groovebox MC-707 Reference Manual page 68

Parameter List
Parameter Value
Selects the type of TVF filter.
* If Filter Type is set to VCF, this will be LPF.
OFF
LPF
BPF
HPF
PKG
TVF Filter Type
LPF2
LPF3
FLAT,
TYPEJP,
VCF TYPE
TYPE-M,
TYPE-P
Filter Slope -12, -18, -24 [dB/Oct]
HPF Cutoff 0–1023
68
Explanation
No filter is used.
Low Pass Filter. This cuts the frequencies
in the region above the cutoff frequency
(Cutoff Frequency). Since this cuts the high-
frequency region, the sound becomes more
mellow. This is the most common filter used
in synthesizers.
Band Pass Filter. This leaves only the
frequencies in the region of the cutoff
frequency (Cutoff Frequency), and cuts
the rest. This can be useful when creating
distinctive sounds.
High Pass Filter. This cuts the frequencies in
the region below the cutoff frequency (Cutoff
Frequency). This is suitable for creating
percussive sounds emphasizing their higher
tones.
Peaking Filter. This emphasizes the
frequencies in the region of the cutoff
frequency (Cutoff Frequency). You can use
this to create wah-wah effects by employing
an LFO to change the cutoff frequency
cyclically.
Low Pass Filter 2. Although frequency
components above the Cutoff frequency
(Cutoff Frequency) are cut, the sensitivity of
this filter is half that of the LPF. This makes
it a comparatively warmer low pass filter.
This filter is good for use with simulated
instrument sounds such as the acoustic
piano.
* If you set "LPF2," the setting for the Resonance
parameter will be ignored (p. 68).
Low Pass Filter 3. Although frequency
components above the Cutoff frequency
(Cutoff Frequency) are cut, the sensitivity of
this filter changes according to the Cutoff
frequency. While this filter is also good for use
with simulated acoustic instrument sounds,
the nuance it exhibits differs from that of
the LPF2, even with the same TVF Envelope
settings.
* If you set "LPF3," the setting for the Resonance
parameter will be ignored (p. 68).
This parameter is effective when Filter Type is
VCF.
Each setting simulates the operation of an
analog synthesizer's LPF. In particular, MG,
JP, and P5 are types that are suitable for
reproducing synthesizer sounds of the past.
This button selects the slope (steepness) of
the filter.
For VCF, you can choose -12, -18, or -24.
For TVF, only -12 or -24 can be selected.
If Filter Type is TVF, the following limitations
apply.
5 You can specify only -12 dB or -24 dB. If
you specify -18 dB, the sound generator
operates internally with the -12 dB setting.
5 If you specify -24 dB, the polyphony will
be lower than if you specify -12 dB.
Specifies the cutoff frequency of the -6 dB
high-pass filter.
* This parameter is effective when Filter Type is
VCF.
Parameter Value
Cutoff 0–1023
Keyfollow -200–+200
Cutoff Velocity Curve FIXED, 1–7
Cutoff Velocity Sens -100–+100
Cutoff Keyfollow
0–127
Base Point
Resonance 0–1023
Resonance Velocity
-100–+100
Sens
Vibrato Cutoff Sens -100–+100
Explanation
Selects the frequency at which the filter
begins to have an effect on the waveform's
frequency components.
With "LPF/LPF2/LPF3" selected for the TVF
Filter Type parameter, lower cutoff frequency
settings reduce a tone's upper harmonics
for a more rounded, warmer sound. Higher
settings make it sound brighter.
If "BPF" is selected for the Filter Type, harmonic
components will change depending on the
TVF Cutoff Frequency setting. This can be
useful when creating distinctive sounds.
With "HPF" selected, higher Cutoff Frequency
settings will reduce lower harmonics to
emphasize just the brighter components of
the sound.
With "PKG" selected, the harmonics to be
emphasized will vary depending on Cutoff
Frequency setting.
Use this parameter if you want the cutoff
frequency to change according to the
key that is pressed. Relative to the cutoff
frequency at the key specified by Cutoff
Keyfollow Base Point, positive "+" values
cause the cutoff frequency to become higher
as you play above the reference key, and
negative "-" values cause the cutoff frequency
to become lower.
Higher values will produce greater change.
Cuto frequency
(Octave)
+200
+100
+2
+50
+1
o 0
-1
-50
-2
-200 -200 -100
C1 C2 C3 C4 C5 C6 C7
Key
Selects one of the following seven curves that
determine how keyboard playing dynamics
(velocity) influence the cutoff frequency. Set
this to "FIXED" if you don't want the Cutoff
frequency to be affected by the keyboard
velocity.
1 2 3 4 5 6
Use this parameter when changing the
cutoff frequency to be applied as a result of
changes in playing velocity. Specify a positive
"+" value if you want the cutoff frequency to
raise when you play strongly, or a negative "-"
value if you want it to lower.
Specifies the reference key when using
Keyfollow to modify the cutoff frequency.
If this is 60, the C4 key (middle C) is the
reference key.
Emphasizes the portion of the sound in
the region of the cutoff frequency, adding
character to the sound. Excessively high
settings can produce oscillation, causing the
sound to distort.
LPF BPF HPF
Level
High
Frequency
Cuto Frequency
Low
Use this parameter when changing the
resonance to be applied as a result of
changes in playing velocity. Specify a positive
"+" value if you want resonance to increase
when you play strongly, or a negative "-" value
if you want it to decrease.
Specifies how the TVF Depth of LFO1 is
affected by the program's Modify Vib Depth.
7
PKG