Roland MC-909 Owner's Manual page 73

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 Velo Curve FIX, 1–7
(Cutoff Frequency
Velocity Curve)
Cutoff Velo Sens -63– +63
(Cutoff Frequency
Velocity Sensitivity)
Resonance 0–127
Reso Velo Sens -63– +63
(Resonance Velocity
Sensitivity)
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.
Curve by which pad playing dynamics will affect the cutoff frequency
If you select "FIX," the cutoff frequency will remain fixed regardless of your playing dynamics.
1 2 3
Amount by which your pad playing dynamics will affect the cutoff frequency
Increasing this value will cause a correspondingly greater difference between softly played and
strongly played notes. Negative (-) values will invert the change.
Amount by which the sound in the region of the cutoff frequency will be emphasized
Increasing this value will produce a more strongly distinctive character. Raising this excessively will
cause oscillation and distortion.
LPF BPF
Level
High
Frequency
Cutoff frequency
Low
Amount by which your pad playing dynamics will affect the resonance
Increasing this value will cause a correspondingly greater difference between softly played and
strongly played notes. Negative (-) values will invert the change.
4 5 6 7
HPF PKG
Rhythm Edit
73