Roland MC-808 Sound List page 46

Patch editing parameters
Filter
These parameters are settings for the TVF (Time Variant Filter). They modify the timbral character of the tone by adjusting the brightness
and fatness of the sound.
Parameter Value
Filter Type OFF, LPF,
BPF, HPF,
PKG, LPF2,
LPF3
Cutoff Frequency 0–127
Cutoff Keyfollow -200– +200
Cutoff Velo Curve FIX, 1–7
(Cutoff Frequency
Velocity Curve)
Cutoff Velo Sens -63– +63
(Cutoff Frequency
Velocity Sensitivity)
46
Description
Type of filter
A filter cuts a specific frequency region of the sound to modify the brightness or thickness of the
sound.
OFF: A filter will not be used.
LPF: Low Pass Filter. Cuts the region that lies above the cutoff frequency. The sound will become
more mellow as the high frequency region is cut. This is the most commonly used type of filter.
BPF: Band Pass Filter. Leaves only the region in the vicinity of the cutoff frequency, and cuts the rest.
Suitable for creating sounds with a distinctive character.
HPF: High Pass Filter. Cuts the region that lies below the cutoff frequency. Suitable for creating per-
cussion instrument sounds that have a distinctive high range.
PKG: Peaking filter. Emphasizes the region in the vicinity of the cutoff frequency. You can create a
wah effect by using an LFO to cyclically modulate the cutoff frequency.
LPF2: Low Pass Filter 2. Cuts the region that lies above the cutoff frequency. This lets you leave the
cutoff frequency fixed, and use the TVF envelope settings to vary the depth of the cutoff. Since this
does not impair the feeling of energy of the sound, it is effective for acoustic-type sounds.
* The resonance setting is ignored.
LPF3: Low Pass Filter 3. Cuts the region that lies above the cutoff frequency. This filter cuts the high
frequency region more gently than LPF2. Since this does not impair the feeling of energy of the sound,
it is effective for acoustic-type sounds.
* The resonance setting is ignored.
Frequency (cutoff frequency) at which the filter will begin affecting the frequency content of the wave-
form
If the Filter Type is LPF/LPF2/LPF3, reducing the cutoff frequency will diminish the higher over-
tones, producing a more mellow sound. Raising the cutoff frequency will brighten the sound.
If the Filter Type is BPF, the cutoff frequency value will change the harmonic content that will be
sounded. This is suitable for creating sounds with a distinctive character.
If the Filter Type is HPF, raising the cutoff frequency will diminish the lower overtones, emphasiz-
ing only the bright portion of the sound.
If the Filter Type is PKG, the cutoff frequency value will change the harmonic content that will be
boosted.
Specifies how the pad position will affect the cutoff frequency
Relative to the cutoff frequency of the C4 key, positive (+) values will raise the cutoff frequency as
you play above C4, and negative (-) values will lower the cutoff frequency as you play above C4. In-
creasing this value will produce a correspondingly greater change.
Cutoff frequency
(Octave)
+2
+1
o
-1
-2
C1 C2 C3 C4
Curve by which velocity will affect the cutoff frequency
If this is "FIX," the cutoff frequency will stay the same regardless of how the velocity varies.
1 2 3
Amount by which velocity will affect the cutoff frequency
+200
+100
+50
0
-50
-200 -100
C5 C6 C7
Key
4 5 6 7